How does the internet work? (Full Course)

Summary
Questions Covered
Why It Matters
Intro

Learn how the internet works.

This course will help someone with no technical knowledge Understand how the internet works. In frost teaches this course with tons of visuals, just like he has taught 1000s of people on Udemy. The internet is a part of our daily life and we use it constantly. Show more

Show less
This course will help someone with no technical knowledge Understand how the internet works. In frost teaches this course with tons of visuals, just like he has taught 1000s of people on Udemy. The internet is a part of our daily life and we use it constantly.

This course explains the basics of the internet in a visual way, suitable for anyone regardless of age or profession.

But what is the internet? Have you ever really thought about it? Have you ever wondered what happens in the background Then you enter a web page? If your answer to all these questions is yes, you are definitely looking at the right course. In this course, I assume you don't know anything, And I am slowly explaining what the internet is. You don't need any prior knowledge to follow this course, since this course tells you everything from scratch, which mean abstractions. These abstractions will allow you to understand the subject without knowing details. I think everyone who uses the internet should know its basic features. Everyone who uses the internet needs to know the ISP. Everyone who uses the internet needs to know that the internet is just cables spread all over developed, And in this course we will go on a journey together And we will look at all these concepts in a very visual way. I mean you will see exactly how the internet works, which are eyes. In addition, at the end of the course, there are some questions related to this course And by answering them you can benefit from this course at the maximum level. Okay, regardless of your age or profession, this course is for everyone. You will absolutely understand what the internet is when you finish this course. So let's dive into it. Now we are going to Show more

Show less
But what is the internet? Have you ever really thought about it? Have you ever wondered what happens in the background Then you enter a web page? If your answer to all these questions is yes, you are definitely looking at the right course. In this course, I assume you don't know anything, And I am slowly explaining what the internet is. You don't need any prior knowledge to follow this course, since this course tells you everything from scratch, which mean abstractions. These abstractions will allow you to understand the subject without knowing details. I think everyone who uses the internet should know its basic features. Everyone who uses the internet needs to know the ISP. Everyone who uses the internet needs to know that the internet is just cables spread all over developed, And in this course we will go on a journey together And we will look at all these concepts in a very visual way. I mean you will see exactly how the internet works, which are eyes. In addition, at the end of the course, there are some questions related to this course And by answering them you can benefit from this course at the maximum level. Okay, regardless of your age or profession, this course is for everyone. You will absolutely understand what the internet is when you finish this course. So let's dive into it. Now we are going to
What is the switch and why do we need it?

Enable computer communication using a switch in a small company.

talk about a scenario. Let's say you are the system administrator of a small company and your boss wants you to enable all these computers to communicate with each other. I'm in. Pc one should be able to communicate with PC seven, our PC five should be able to communicate with PC four and so on. He's got the point. But the question is: how do we do such a task? And this is where the solution device comes into play. The switch is the device we use for computers in the same Show more

Show less
talk about a scenario. Let's say you are the system administrator of a small company and your boss wants you to enable all these computers to communicate with each other. I'm in. Pc one should be able to communicate with PC seven, our PC five should be able to communicate with PC four and so on. He's got the point. But the question is: how do we do such a task? And this is where the solution device comes into play. The switch is the device we use for computers in the same

Seven computers in the same office can communicate with each other using a switch.

environment to communicate with each other. When I say in the same environment, what I mean is that I'm talking about computers in the same office house or at work close distance to each other, And this scenario is a good example for such a situation. There is an office and in this office we have seven computers that communication of them is required. Wonderful, We have a switch to accomplish the communication of computers. This is good. However, the question is: Can these seven computers communicate with each other right now And the answer is big Now because first of all these seven Show more

Show less
environment to communicate with each other. When I say in the same environment, what I mean is that I'm talking about computers in the same office house or at work close distance to each other, And this scenario is a good example for such a situation. There is an office and in this office we have seven computers that communication of them is required. Wonderful, We have a switch to accomplish the communication of computers. This is good. However, the question is: Can these seven computers communicate with each other right now And the answer is big Now because first of all these seven

Computers connect to switches using cables, typically copper (cat5/cat6) or fiber optic for faster data transmission.

computers need to interact with the switch somehow But how can we do that I know that you have some ideas and you are probably guessing right we must use cables to connect computers to the switch As you can see we are connecting all the computers to the switch with the help of cables We generally use copper cables for this task And the type of these copper cables can generally be cat five cable or cat six cable in small environments By the way cat six cables are faster than cat five cables and cat represents category okay On the other hand in addition to copper cables some switches support fiber optic cables as well And it is important to note that fiber op tic cables are generally much faster compared to copper cables in data transmission This is very important And for switch devices there is a crucial point to be aware of Please note that if there is a switch in the environment and if you want to connect computers to Show more

Show less
computers need to interact with the switch somehow But how can we do that I know that you have some ideas and you are probably guessing right we must use cables to connect computers to the switch As you can see we are connecting all the computers to the switch with the help of cables We generally use copper cables for this task And the type of these copper cables can generally be cat five cable or cat six cable in small environments By the way cat six cables are faster than cat five cables and cat represents category okay On the other hand in addition to copper cables some switches support fiber optic cables as well And it is important to note that fiber op tic cables are generally much faster compared to copper cables in data transmission This is very important And for switch devices there is a crucial point to be aware of Please note that if there is a switch in the environment and if you want to connect computers to

Switches require cables, not wireless technology, to connect computers.

that switch we must definitely use a cable that has generally a copper cable or fiber optic cable What I have tried to say is with wireless technology, you cannot connect computers to a switch. Switches only work with cables. This is very vital, guys. If you want to use a switch device, you have to use cable to connect your devices to the switch. It's that simple. However, if you want to connect computers in the same environment to each other by using all the wireless technology, you can use an access point device. In If I switch device, I mean you can use both a switch device or an access point device In order to connect all the seven computers. Both of them separately is acceptable for this purpose. The only difference between these devices is access points use wireless technology, while switches use cables. Okay, there are seven computers in this Show more

Show less
that switch we must definitely use a cable that has generally a copper cable or fiber optic cable What I have tried to say is with wireless technology, you cannot connect computers to a switch. Switches only work with cables. This is very vital, guys. If you want to use a switch device, you have to use cable to connect your devices to the switch. It's that simple. However, if you want to connect computers in the same environment to each other by using all the wireless technology, you can use an access point device. In If I switch device, I mean you can use both a switch device or an access point device In order to connect all the seven computers. Both of them separately is acceptable for this purpose. The only difference between these devices is access points use wireless technology, while switches use cables. Okay, there are seven computers in this

Switches and access points enable computer communication using cables or wireless technology.

environment And we can connect these seven computers By using switches and cables, just like you see in the picture. Or, in the same way, we can use an access point device instead of a switch device, And if you use an access point device, access point uses wireless technology instead of cables while communicating with devices. In summary, both the switch device or an access point device enable these seven computers to communicate. This is obvious, but one uses cable and the other one uses wireless technology. Anyway, what I just want you to know right now is Show more

Show less
environment And we can connect these seven computers By using switches and cables, just like you see in the picture. Or, in the same way, we can use an access point device instead of a switch device, And if you use an access point device, access point uses wireless technology instead of cables while communicating with devices. In summary, both the switch device or an access point device enable these seven computers to communicate. This is obvious, but one uses cable and the other one uses wireless technology. Anyway, what I just want you to know right now is

Copper cables connect computers to create a local area network (LAN).

we generally use copper cables in order to connect computers to the switch in the environment, such as a home or office. By the way, I want to focus on the source device instead of the access point device in discourse. Wherever And at this moment, all these computers can communicate with each other, which is because they connected to the switch by using cables, And this means that they created a network. In other words, the reason that these computers can communicate with each other is all of them are in the same network, and we call this special network as local area network or briefly, LAN. A local area network is a collection of devices connected Show more

Show less
we generally use copper cables in order to connect computers to the switch in the environment, such as a home or office. By the way, I want to focus on the source device instead of the access point device in discourse. Wherever And at this moment, all these computers can communicate with each other, which is because they connected to the switch by using cables, And this means that they created a network. In other words, the reason that these computers can communicate with each other is all of them are in the same network, and we call this special network as local area network or briefly, LAN. A local area network is a collection of devices connected

Creating a LAN requires computers to be in the same physical location, such as a building or office.

together in non physical location, such as a building, office or harm. As I just said, if you want to create a LAN, this location must be a restricted location in terms of area. I mean you cannot create a LAN between computers located in United States and computers located in Russia. On the other hand, this area is very suitable area in order to create a LAN. Therefore, these computers can communica te with each other because all of them are on the same land With the help of this search search we can deduce that if you want to create a LAN when it is the wish device By using a switch device we can create a local area network And if we consider the millions of local area network all over the world we can easily understand how important is swish device is you might think that all the houses in the world are actually a local area network you have a LAN in your house or your neighbor's home also has a LAN or there is also a LAN in the office where you work Okay you catch the idea And now let's take a closer look at the communication of computers And what this event actually Show more

Show less
together in non physical location, such as a building, office or harm. As I just said, if you want to create a LAN, this location must be a restricted location in terms of area. I mean you cannot create a LAN between computers located in United States and computers located in Russia. On the other hand, this area is very suitable area in order to create a LAN. Therefore, these computers can communica te with each other because all of them are on the same land With the help of this search search we can deduce that if you want to create a LAN when it is the wish device By using a switch device we can create a local area network And if we consider the millions of local area network all over the world we can easily understand how important is swish device is you might think that all the houses in the world are actually a local area network you have a LAN in your house or your neighbor's home also has a LAN or there is also a LAN in the office where you work Okay you catch the idea And now let's take a closer look at the communication of computers And what this event actually

PC one sends a message to PC six using packets.

represent Let's say pc one was to send a message to the PCs six By the way the messages generated by computers has a few special names some people call them as packet and some people call them as frame both of them is okay but in this course I prefer to use packet instead of frame Okay PC one Show more

Show less
represent Let's say pc one was to send a message to the PCs six By the way the messages generated by computers has a few special names some people call them as packet and some people call them as frame both of them is okay but in this course I prefer to use packet instead of frame Okay PC one

A switch connects multiple devices on a network, allowing them to communicate with each other by sending packets to their destinations.

you set a packet to the PC six As you see in Division the packet first goes to the switch and then the switch looks at the inside of the packet or learns the destination of the packet And finally the switch sends the packet to its destination And if pc one can set a packet to the PC six, this means that PC One and PC six can communicate with each other. The logic is basically this: if a computer can send a packet to another computer, this refers to these two computers are on the same network and they can communicate with each other. This information is so crucial, guys, okay. However, maybe by looking at only this switch image, what the switch device actually is may not be fully visualized in your mind. For this reason, we will now examine this slide for you to understand the event better. This is the real version of a switch device And, as you can see, there are many ports on a switch device. This is important. Also, the number of ports varies from one switch device to another switch device. I mean, different switches have different numbers of ports. Some switches have 10 ports, while some switches have more than transports, and of course, this generally leads to an increase in price. Okay, By the way, these ports have a special name and they are called LAN ports. This probably makes sense to you because, as you know, we create lands by using 3g devices. For this reason, I think it is so reasonable to call these ports LAN ports, Because by connecting these computers to these ports, we can create a LAN. And in addition to this, there are LAN ports on the back of our computers or on the side of our laptops, just like these LAN ports. You can see the Related regionals on the right side. And to establish a connection between computers and the switch, we connect the LAN port on the computer and the LAN port on the switch with the help of a cable. So let's do this. Let's start with this port and PC one, then let's connect this port and P theater. After that let's connect this port and PC three. And finally, I want to make a connection between this port and PC four. Wonderful, And currently these computers can communicate with each other, But how exactly does this Show more

Show less
you set a packet to the PC six As you see in Division the packet first goes to the switch and then the switch looks at the inside of the packet or learns the destination of the packet And finally the switch sends the packet to its destination And if pc one can set a packet to the PC six, this means that PC One and PC six can communicate with each other. The logic is basically this: if a computer can send a packet to another computer, this refers to these two computers are on the same network and they can communicate with each other. This information is so crucial, guys, okay. However, maybe by looking at only this switch image, what the switch device actually is may not be fully visualized in your mind. For this reason, we will now examine this slide for you to understand the event better. This is the real version of a switch device And, as you can see, there are many ports on a switch device. This is important. Also, the number of ports varies from one switch device to another switch device. I mean, different switches have different numbers of ports. Some switches have 10 ports, while some switches have more than transports, and of course, this generally leads to an increase in price. Okay, By the way, these ports have a special name and they are called LAN ports. This probably makes sense to you because, as you know, we create lands by using 3g devices. For this reason, I think it is so reasonable to call these ports LAN ports, Because by connecting these computers to these ports, we can create a LAN. And in addition to this, there are LAN ports on the back of our computers or on the side of our laptops, just like these LAN ports. You can see the Related regionals on the right side. And to establish a connection between computers and the switch, we connect the LAN port on the computer and the LAN port on the switch with the help of a cable. So let's do this. Let's start with this port and PC one, then let's connect this port and P theater. After that let's connect this port and PC three. And finally, I want to make a connection between this port and PC four. Wonderful, And currently these computers can communicate with each other, But how exactly does this

This lesson explains how computers connected to a switch can communicate with each other on a local area network.

communication happen From a switch perspective? Let's take a look at this. Let's say pc one master communicate with PC far saw it will send a packet to the PC far. This packet will go to this part of the switch first, And there we go Afterwards that part. We will give the packet to the hardware inside the switch Okay Then this switch we look inside this packet our loves his destination After that the switch give this packet to this port that is connected to PC far And finally the switch says the packet to the PC far Okay wonderful And to summarize currently we have connected these four computers to each other thanks to this switch This means we have created a local area network And these computers can easily communicate with each other Since they're on the same LAN I hope everything is quite good software And the switch device is visual ized spreader in your mind thanks to this slide But there is a little issue here Let me explain If you are aware our computers were in the same network And we have only talked about the communication between dos devices We have never talked about how these computers can connect to the internet Right So the question is Can these computers communicate with the internet just by having a switch device And this my friends will be the question that we are looking for an answer in the next lesson See you guys soon Bye In our previous lesson we briefly talked about Show more

Show less
communication happen From a switch perspective? Let's take a look at this. Let's say pc one master communicate with PC far saw it will send a packet to the PC far. This packet will go to this part of the switch first, And there we go Afterwards that part. We will give the packet to the hardware inside the switch Okay Then this switch we look inside this packet our loves his destination After that the switch give this packet to this port that is connected to PC far And finally the switch says the packet to the PC far Okay wonderful And to summarize currently we have connected these four computers to each other thanks to this switch This means we have created a local area network And these computers can easily communicate with each other Since they're on the same LAN I hope everything is quite good software And the switch device is visual ized spreader in your mind thanks to this slide But there is a little issue here Let me explain If you are aware our computers were in the same network And we have only talked about the communication between dos devices We have never talked about how these computers can connect to the internet Right So the question is Can these computers communicate with the internet just by having a switch device And this my friends will be the question that we are looking for an answer in the next lesson See you guys soon Bye In our previous lesson we briefly talked about
What is the router?

Use a router to connect computers in the office to the internet.

how to connect computers in our office and how do we create a network and I said that we can create a LAN with the help of a service device But the problem is, currently these computers can only communicate amongst themselves. They cannot communicate with the internet, because the all the task of the switch is to create a LAN and enable the communication of the devices in the same land. Great, And, by the way, I would like to remove this lamp statement from the visual, because you can understand that there is a LAN here. Thus we can work more comfortably. Wonderful. And the main question is: how do we connect these computers to the internet? And this is where the router device comes into play. Let me explain. The main task of the router is to enable computers to connect to the internet. Without a router, it is Show more

Show less
how to connect computers in our office and how do we create a network and I said that we can create a LAN with the help of a service device But the problem is, currently these computers can only communicate amongst themselves. They cannot communicate with the internet, because the all the task of the switch is to create a LAN and enable the communication of the devices in the same land. Great, And, by the way, I would like to remove this lamp statement from the visual, because you can understand that there is a LAN here. Thus we can work more comfortably. Wonderful. And the main question is: how do we connect these computers to the internet? And this is where the router device comes into play. Let me explain. The main task of the router is to enable computers to connect to the internet. Without a router, it is

Internet connection requires connecting switch to router and water to internet.

impossible for us to connect to the internet. And in order to provide this connection- I mean in order to provide a connection to the Internet- First of all we must connect this switch to this router. And this cable is a copper cable Just like other cables. This is good, But currently what we have to do isn't over. We still can't connect to the internet in this situation, because we need a connection between the water and the internet as well. And, as you know, a special cable Show more

Show less
impossible for us to connect to the internet. And in order to provide this connection- I mean in order to provide a connection to the Internet- First of all we must connect this switch to this router. And this cable is a copper cable Just like other cables. This is good, But currently what we have to do isn't over. We still can't connect to the internet in this situation, because we need a connection between the water and the internet as well. And, as you know, a special cable

Internet service providers provide us with a cable to connect to the internet.

comes to our homes or offices and this cable is given us by internet service provider and takes to this cable We connect to the internet. If you have never heard of internet service service provider, Don't worry, we will talk about it in detail. But for now, all you need to know is the internet service provider is giving us this cable for a certain amount of money, so that we can connect to the internet easily. Okay, so currently we have everything necessary to connect to the internet By using these computers. Hams, let's see the basic tasks of the switch and router one by one. On the animation, These seven computers in the Show more

Show less
comes to our homes or offices and this cable is given us by internet service provider and takes to this cable We connect to the internet. If you have never heard of internet service service provider, Don't worry, we will talk about it in detail. But for now, all you need to know is the internet service provider is giving us this cable for a certain amount of money, so that we can connect to the internet easily. Okay, so currently we have everything necessary to connect to the internet By using these computers. Hams, let's see the basic tasks of the switch and router one by one. On the animation, These seven computers in the

Switches allow computers in the same network to communicate with each other, but routers are needed for internet communication.

office can communicate with each other thanks to the switch. For example, let's say, pc one was to communicate with PC five. For this purpose, PC one will send a packet to the PC five, sir, is you know, the packet firstly goes to the switch And afterwards this switch learns the destination of the packet And finally this switch sends the packet to its destination. And there we go. This is how two computers in the same land communicate with each other. And please always remember, a switch device is enough for us in order for communication of devices in the same land On the other hand a router has no role in the communication of different devices in the same line like PC One and PC five This is very vital Okay I hope I could explain the events And however guys what if pc one was to communicate with the internet In other words what will happen if pc one first to send a packet to the internet Let's see First of all you should remember this information If Show more

Show less
office can communicate with each other thanks to the switch. For example, let's say, pc one was to communicate with PC five. For this purpose, PC one will send a packet to the PC five, sir, is you know, the packet firstly goes to the switch And afterwards this switch learns the destination of the packet And finally this switch sends the packet to its destination. And there we go. This is how two computers in the same land communicate with each other. And please always remember, a switch device is enough for us in order for communication of devices in the same land On the other hand a router has no role in the communication of different devices in the same line like PC One and PC five This is very vital Okay I hope I could explain the events And however guys what if pc one was to communicate with the internet In other words what will happen if pc one first to send a packet to the internet Let's see First of all you should remember this information If

A computer can communicate with the internet by sending packets through a switch to a router, which then sends the packets to the internet.

a computer can send packets to the internet This means that this computer communica tes with the internet For the speaking I believe that you exactly understand the logic of this event anymore If we can send packets from one point to another point these two points can communicate It's that simple But the question is how will pc one send packets to the internet To be able to do this first PC one must start its packet to the switch just like before because there is no other way for PC one to be able to eat the router right I mean if pc one was to send a packet to the internet this packet must reach the router no matter what because the router is a door to access the internet This is obvious Hence if pc one wants to communicate with the router it must start its packet to the switch first. After that, the switch looks at inside of the packet and understand that the packet wants to go to the internet, So it sends the packet to the router, And there we go. And then the router firstly looks at the inside of the packet and understand that the packet wants to go to the internet, And afterwards it sends the packet to the internet over this part, And there we go. By the way, if you're aware, we have plucked this cable that we purchased from the ISP into this port. This is our base. I believe that currently you can easily imagine in an intuitive manner how the cables coming to router like this or like this are plugged into the ports. I mean, there are some ports on router and you need to put the cables into that box. It's that simple. I will not show this visually because detailed information about the ports isn't important for you At this moment. You just must understand the logic behind the router. Okay, And as a result, PC one sent its packet to the internet. In other words, PC one and the internet communicated, And the device that helped us to connect to the internet is durata, Wonderful. I believe that you Show more

Show less
a computer can send packets to the internet This means that this computer communica tes with the internet For the speaking I believe that you exactly understand the logic of this event anymore If we can send packets from one point to another point these two points can communicate It's that simple But the question is how will pc one send packets to the internet To be able to do this first PC one must start its packet to the switch just like before because there is no other way for PC one to be able to eat the router right I mean if pc one was to send a packet to the internet this packet must reach the router no matter what because the router is a door to access the internet This is obvious Hence if pc one wants to communicate with the router it must start its packet to the switch first. After that, the switch looks at inside of the packet and understand that the packet wants to go to the internet, So it sends the packet to the router, And there we go. And then the router firstly looks at the inside of the packet and understand that the packet wants to go to the internet, And afterwards it sends the packet to the internet over this part, And there we go. By the way, if you're aware, we have plucked this cable that we purchased from the ISP into this port. This is our base. I believe that currently you can easily imagine in an intuitive manner how the cables coming to router like this or like this are plugged into the ports. I mean, there are some ports on router and you need to put the cables into that box. It's that simple. I will not show this visually because detailed information about the ports isn't important for you At this moment. You just must understand the logic behind the router. Okay, And as a result, PC one sent its packet to the internet. In other words, PC one and the internet communicated, And the device that helped us to connect to the internet is durata, Wonderful. I believe that you

Basic tasks of sewage and water explained.

understand the most basic tasks of the sewage and water, And I hope the information may be useful for better understanding. However, I want to ask you two questions. My first question is: can you visualize the internet in your mind? And the second question is: what exactly does the internet meme? And these will be the e quations that we are going to discuss in the next lessons. See, you guys, Before discussing the Show more

Show less
understand the most basic tasks of the sewage and water, And I hope the information may be useful for better understanding. However, I want to ask you two questions. My first question is: can you visualize the internet in your mind? And the second question is: what exactly does the internet meme? And these will be the e quations that we are going to discuss in the next lessons. See, you guys, Before discussing the
What does the internet represent (Part-1)?

Understanding how packets move on the internet for beginners.

meaning of connecting to the internet from a computer perspective, I think it is helpful to know what the internet exactly stands for, Because if you're really starting from scratch- I mean I assume that you are real newbies- you may not know exactly what the internet is. For this reason, I want to visualize the internet for a better understanding. To do this, in this lesson we are going to see how a packet moves on the internet. By the way, keep in mind that this model USA is a simplified model designed to make the concept is the john deere stat. So this structure in real life is much more complex than you see, individual. But with this simplified model you will understand the logic of the event very well I promise you And I believe that's all you need right now is you can see there are many Show more

Show less
meaning of connecting to the internet from a computer perspective, I think it is helpful to know what the internet exactly stands for, Because if you're really starting from scratch- I mean I assume that you are real newbies- you may not know exactly what the internet is. For this reason, I want to visualize the internet for a better understanding. To do this, in this lesson we are going to see how a packet moves on the internet. By the way, keep in mind that this model USA is a simplified model designed to make the concept is the john deere stat. So this structure in real life is much more complex than you see, individual. But with this simplified model you will understand the logic of the event very well I promise you And I believe that's all you need right now is you can see there are many

Routers connect devices to the internet, allowing communication between computers in different locations.

routers on the internet right And there is a special reason for this So at this moment I would like to give you another piece of information about errata irata is a device required for a computer or electronic device to connect to the internet you know this definition On the other hand you can think of the router is the device we use to communicate with your computer in another part of the world or you can think of the router is the device we use to communicate with a computer in a different plan I mean if you are aware there is a LAN here right And there is another LAN here this is obvious Therefore we can draw the following conclusion connect ing to the internet actually can stand for connecting to the another computer located anywhere in the world I mean you can think of the internet is the structure that connects all the lands all over the world I want to repeat this again you can think of the internet is a structure that connects all lamps all over devout And as you know there are millions of lamps connected to the internet except these lands Wonderful I Show more

Show less
routers on the internet right And there is a special reason for this So at this moment I would like to give you another piece of information about errata irata is a device required for a computer or electronic device to connect to the internet you know this definition On the other hand you can think of the router is the device we use to communicate with your computer in another part of the world or you can think of the router is the device we use to communicate with a computer in a different plan I mean if you are aware there is a LAN here right And there is another LAN here this is obvious Therefore we can draw the following conclusion connect ing to the internet actually can stand for connecting to the another computer located anywhere in the world I mean you can think of the internet is the structure that connects all the lands all over the world I want to repeat this again you can think of the internet is a structure that connects all lamps all over devout And as you know there are millions of lamps connected to the internet except these lands Wonderful I

Routers are important for connecting millions of local area networks together, and there are many routers instead of just one to ensure efficient internet connectivity.

that everything is good so far, but there's a thing that we need to consider. So I want to ask you a question: Why are there so many routers here? Let me explain it in a simple manner. First, you should know that these routers are distributed around the world in an organized manner. However, routers aren't the only devices in the structure. This is important. There are tons of routers and other different devices in this structure, distributed pre divide layer. But focusing on only routers is enough for us in order to understand the concept behind the internet. And the first question that comes to your mind is probably why routers are so important to the internet. As a matter of fact, the answer to this question is hidden in the core task of errata. The device we use to en able different lands to communicate with each other is dhiraj Right And text to the internet. We can connect all the laughs in the world to each other, You know. For this reason, it makes perfect sense to use many routers to connect millions of local area networks together. These last few, see, are just two of the millions of local area networks all over the world. In summary, if the internet must connect millions of local area networks, it is obvious that it needs routers. I hope you got this, And once you understand the importance of the router for the internet, you probably think of another question. And the second question that probably comes to your mind is why there are so many routers instead of just one router. And I think this is a more critical question than the first question. And let me answer it on the ratio. But before answering this question, there is something in this picture that should catch your attention. Please look carefully at the picture and try to find this difference, As you can see these last on the visual: one device instead of a switch and a router. So if there is no switch in the environment, how can there be a LAN? Or if there is no router in the environment, How can it be connected to the Internet? And this is where the home router comes into play. The home router is a Show more

Show less
that everything is good so far, but there's a thing that we need to consider. So I want to ask you a question: Why are there so many routers here? Let me explain it in a simple manner. First, you should know that these routers are distributed around the world in an organized manner. However, routers aren't the only devices in the structure. This is important. There are tons of routers and other different devices in this structure, distributed pre divide layer. But focusing on only routers is enough for us in order to understand the concept behind the internet. And the first question that comes to your mind is probably why routers are so important to the internet. As a matter of fact, the answer to this question is hidden in the core task of errata. The device we use to en able different lands to communicate with each other is dhiraj Right And text to the internet. We can connect all the laughs in the world to each other, You know. For this reason, it makes perfect sense to use many routers to connect millions of local area networks together. These last few, see, are just two of the millions of local area networks all over the world. In summary, if the internet must connect millions of local area networks, it is obvious that it needs routers. I hope you got this, And once you understand the importance of the router for the internet, you probably think of another question. And the second question that probably comes to your mind is why there are so many routers instead of just one router. And I think this is a more critical question than the first question. And let me answer it on the ratio. But before answering this question, there is something in this picture that should catch your attention. Please look carefully at the picture and try to find this difference, As you can see these last on the visual: one device instead of a switch and a router. So if there is no switch in the environment, how can there be a LAN? Or if there is no router in the environment, How can it be connected to the Internet? And this is where the home router comes into play. The home router is a

Home router is sufficient for small environments with few devices.

common device consisting of a router and switch combination hands these devices in the last hour mix of the switch and router. This means that if we have a home router, we don't need an additional switch And Roger. This device is enough for small and moments like a home or small office This is important I won't repeat this again a home router is enough for us in small environments or if there are very few devices in the environment okay I showed you home router because most of you have these devices in your home and you connect to the Show more

Show less
common device consisting of a router and switch combination hands these devices in the last hour mix of the switch and router. This means that if we have a home router, we don't need an additional switch And Roger. This device is enough for small and moments like a home or small office This is important I won't repeat this again a home router is enough for us in small environments or if there are very few devices in the environment okay I showed you home router because most of you have these devices in your home and you connect to the

Multiple routers are needed due to network size.

internet by using home routers For this reason I wanted to tell you what these devices are in order to avoid confusion However please note that if there are too many devices in the environment the home router will be insufficient And you may need additional switch and router you catch the idea And now let's go back to our question why there are so many routers instead of just a single router Imagine that there is a single router in the middle of the world Show more

Show less
internet by using home routers For this reason I wanted to tell you what these devices are in order to avoid confusion However please note that if there are too many devices in the environment the home router will be insufficient And you may need additional switch and router you catch the idea And now let's go back to our question why there are so many routers instead of just a single router Imagine that there is a single router in the middle of the world

Millions of devices connected to one router, impossible to design.

instead of 1000s of routers distributed all over the world In this case millions of electronic devices around the world will tell to be connected to the same router This is obvious this means that this single router needs millions of parts isn't it And it is impossible to design such a device But this is not done the problem In addition to it if there was only one router the entire lot of the all devices in the world 't be on that router. And this is another problem, Because in computer science we Show more

Show less
instead of 1000s of routers distributed all over the world In this case millions of electronic devices around the world will tell to be connected to the same router This is obvious this means that this single router needs millions of parts isn't it And it is impossible to design such a device But this is not done the problem In addition to it if there was only one router the entire lot of the all devices in the world 't be on that router. And this is another problem, Because in computer science we

Single point of failure and cable length issues can be solved with a distributed internet structure.

don't want to give all too lot on a single point. We even call this problem the single point of failure, And this is a problem that needs to be considered to be able to teach it better. Let me give you an example. Imagine this router is broken somehow. This means that the Internet of the whole world is crashing down at the same time, right? Because we only use a single router to connect all this around the world. Rule two broke down and the whole internet crashed down. It's that simple. Just think about the consequences of this problem In a second. This will be terrible, right? And so far we have talked about two vital problems, But it isn't our. Another major problems is the cable length problem. Imagine how long the cable must be if there was all one giant router in the middle of the world. Especially LANs that are the furthest from the giant router will need very long cable s. This is obvious, right? Therefore, this design is a very problematic design, And the solution for all these problems is this distributed structure all over developed. You catch the idea, But to make sure you fully understand the main logic of this structure, I want you to do an exercise. I want you to determine why such a structure eliminates the problems we talk ed about shortly before. I'm sure that you can handle this. Just do it, guys. I asked you a question Show more

Show less
don't want to give all too lot on a single point. We even call this problem the single point of failure, And this is a problem that needs to be considered to be able to teach it better. Let me give you an example. Imagine this router is broken somehow. This means that the Internet of the whole world is crashing down at the same time, right? Because we only use a single router to connect all this around the world. Rule two broke down and the whole internet crashed down. It's that simple. Just think about the consequences of this problem In a second. This will be terrible, right? And so far we have talked about two vital problems, But it isn't our. Another major problems is the cable length problem. Imagine how long the cable must be if there was all one giant router in the middle of the world. Especially LANs that are the furthest from the giant router will need very long cable s. This is obvious, right? Therefore, this design is a very problematic design, And the solution for all these problems is this distributed structure all over developed. You catch the idea, But to make sure you fully understand the main logic of this structure, I want you to do an exercise. I want you to determine why such a structure eliminates the problems we talk ed about shortly before. I'm sure that you can handle this. Just do it, guys. I asked you a question
What does the internet represent (Part-2)?

Using a single router in the middle of the world can cause overloading and cable mess, but a different structure can minimize these issues.

at the end of the previous lesson And I know that you were all analyzing the situation, But let's do it together, just in case. Is you know, if he used a single router in the middle of the world, we will have problems with the overloading of the router. On the other hand, we will need made alone cables for less that are the furthest from the giant router. But, as you can see, in this structure the cables don't have to be that long, And this is an important advantage. Actually, of course, we can need long cables in this structure too, but not as much as in the other structure. After all, in this structure there can be many kilometers between two routers. This is reasonable. However, this is by no means laying cables from one end of the world to the other end, right? And while we only connect two routers with one cable in this structure we will connect millions of lamp s to the giant router in the other structure So we will need a lot of Furlong cables to a single point and it creates a huge mess Imagine cables coming to the giant router from millions of lamps that locate in the farthest area He got the point by using this structure we min imize the cable mess and be avoid overloading of errata everything is good But what Show more

Show less
at the end of the previous lesson And I know that you were all analyzing the situation, But let's do it together, just in case. Is you know, if he used a single router in the middle of the world, we will have problems with the overloading of the router. On the other hand, we will need made alone cables for less that are the furthest from the giant router. But, as you can see, in this structure the cables don't have to be that long, And this is an important advantage. Actually, of course, we can need long cables in this structure too, but not as much as in the other structure. After all, in this structure there can be many kilometers between two routers. This is reasonable. However, this is by no means laying cables from one end of the world to the other end, right? And while we only connect two routers with one cable in this structure we will connect millions of lamp s to the giant router in the other structure So we will need a lot of Furlong cables to a single point and it creates a huge mess Imagine cables coming to the giant router from millions of lamps that locate in the farthest area He got the point by using this structure we min imize the cable mess and be avoid overloading of errata everything is good But what

Load balancing and distributed structure in routers improve efficiency and prevent single point of failure.

about a lot of rodding since there are many routers load balanced process is very efficient in the distributed structure I mean this system works very well And in addition to load bala ncing it solves the single point of failure problem as well For example this router this router this router and this router are broken somehow in this case the internet continues to work properly right Only its efficiency decreases a bit On the other hand when there is only one router and if this router is broken the whole internet crushes down and this was very bad So I believe that consistency is very important for such a huge structure like the internet And now I want to show you a visual that shows the cables between different countries and different continents With this visual you Show more

Show less
about a lot of rodding since there are many routers load balanced process is very efficient in the distributed structure I mean this system works very well And in addition to load bala ncing it solves the single point of failure problem as well For example this router this router this router and this router are broken somehow in this case the internet continues to work properly right Only its efficiency decreases a bit On the other hand when there is only one router and if this router is broken the whole internet crushes down and this was very bad So I believe that consistency is very important for such a huge structure like the internet And now I want to show you a visual that shows the cables between different countries and different continents With this visual you

Underwater cables are crucial for international internet communication, with 99% of it relying on these cables; breaking one can cause an entire continent's internet to go down.

will understand much better what the internet is These cables are very important especially for the communication of countries that there is an ocean between them, And this visual represents real life itself, Unlike the simplified model we use. 99% of all international communication on the internet is provided by these 468 cable lies late under the water. This is very crucial, guys. Some of these cables are only 131 kilometers long, while others are around 20,000 kilometers long, and so on. And the funny thing is: breaking one of these cables can cause the Internet of a whole continent to go away in a flash time. In fact, it was happen such an event in 2018.. And I want to show this on a different image. Okay, I want you to focus on this red cable. This is an almost 17,000 blog cable that starts in France or reaches third Africa, And this cable connects down to two countries on the west coast of Europe and Africa to each other and to the internet, And the Internet of 10 of these countries crashed down when efficient port accidently cut the cable, And I think this was a definitely a tragic, karmic event. In addition to this is you can imagine, this is not the only problem that happens to cables, because we are talking about 4 million kilometer long cables spread all over the world. So there must be something more. As a matter of fact, nearly 200 problems are encountered each year, And these are substantially related to shifts or natural disasters, And there is a fun reason that I prefer to use substantially words. Let me explain. In 2007, see, pirates stall 11 kilometers of a cable connecting Thailand, Vietnam and Hong Kong to each other And they sold this long cable as scrap by dividing it, And I think Show more

Show less
will understand much better what the internet is These cables are very important especially for the communication of countries that there is an ocean between them, And this visual represents real life itself, Unlike the simplified model we use. 99% of all international communication on the internet is provided by these 468 cable lies late under the water. This is very crucial, guys. Some of these cables are only 131 kilometers long, while others are around 20,000 kilometers long, and so on. And the funny thing is: breaking one of these cables can cause the Internet of a whole continent to go away in a flash time. In fact, it was happen such an event in 2018.. And I want to show this on a different image. Okay, I want you to focus on this red cable. This is an almost 17,000 blog cable that starts in France or reaches third Africa, And this cable connects down to two countries on the west coast of Europe and Africa to each other and to the internet, And the Internet of 10 of these countries crashed down when efficient port accidently cut the cable, And I think this was a definitely a tragic, karmic event. In addition to this is you can imagine, this is not the only problem that happens to cables, because we are talking about 4 million kilometer long cables spread all over the world. So there must be something more. As a matter of fact, nearly 200 problems are encountered each year, And these are substantially related to shifts or natural disasters, And there is a fun reason that I prefer to use substantially words. Let me explain. In 2007, see, pirates stall 11 kilometers of a cable connecting Thailand, Vietnam and Hong Kong to each other And they sold this long cable as scrap by dividing it, And I think

This image shows intercontinental internet connections under water, with fiber optic cables being the fastest and most reliable.

this event is more surprising than the incredible infrastructure of the internet. Now I have back to the first slide, because there is something I want to show here. These colorful cables generally represent intercontinental connections under waters, But, for example, if you look at Russia, land cables are not visible on this image. Please don't be confused about it. Of course there are cables and routers distributed all over Russia. They are just ignored in this image. I mean, the main purpose of this image was to show you how devices from different continents are interconnected under the water. Okay, Also, not that all of these cables under waters are fiber optic cables, Because the fastest data transmission cable type is fiber optic cables And intercontinental data transmission must occur at the highest speed right And another reason of why we don't use copper cables is well the length of the copper cables increases the probability of errors in data transmission increases as well On the other hand even if the fiber optic cables are very long they transmit the data to its destination almost without error And this is another reason that why fiber optic cables are used over long distances Great I think it is important for you to understand Show more

Show less
this event is more surprising than the incredible infrastructure of the internet. Now I have back to the first slide, because there is something I want to show here. These colorful cables generally represent intercontinental connections under waters, But, for example, if you look at Russia, land cables are not visible on this image. Please don't be confused about it. Of course there are cables and routers distributed all over Russia. They are just ignored in this image. I mean, the main purpose of this image was to show you how devices from different continents are interconnected under the water. Okay, Also, not that all of these cables under waters are fiber optic cables, Because the fastest data transmission cable type is fiber optic cables And intercontinental data transmission must occur at the highest speed right And another reason of why we don't use copper cables is well the length of the copper cables increases the probability of errors in data transmission increases as well On the other hand even if the fiber optic cables are very long they transmit the data to its destination almost without error And this is another reason that why fiber optic cables are used over long distances Great I think it is important for you to understand

Understanding the internet is crucial for all areas.

what the internet really is It is very vital to be able to visualize it in your Might because no matter what area of it you are dealing with you need to grasp this basic subject Actually there was something else I wanted to show in this lesson But I don't want to extend this lesson any further we will continue where we left off in the next lesson that will be a very important lesson See you guys in a moment In this lesson we are going Show more

Show less
what the internet really is It is very vital to be able to visualize it in your Might because no matter what area of it you are dealing with you need to grasp this basic subject Actually there was something else I wanted to show in this lesson But I don't want to extend this lesson any further we will continue where we left off in the next lesson that will be a very important lesson See you guys in a moment In this lesson we are going
What does the internet represent (Part-3)?

This tutorial explains how packets move over the internet and how devices in different networks communicate with each other.

to discuss how a packet moves over the internet In this way you will understand how to devices in different countries communicate with each other will see this on an example. Let's say this computer in LAN one was to communicate with this computer in Atlanta. Okay, In other words, let's assume that this computer first to send a special pack et to this computer. So this packet must go to this router to exit from the land one. You know, because our destination is the art of land one. I mean it is a different network. Our destination is Atlanta and we can set our packet over the Internet to land. And now we are going to do this exactly. First, this computer sends the packet to the switch. After the switch receives the packet, this switch looks at the destination address of the packet and understand that it has to send the packet to the router. And after the raw to receive the packet, Reuter looks at the content of it and learns his destination address. Hence it understand that it must send the packet to the internet because the destination of the packet is in a different network than LAN one. So router must start the packet to this router that is connected, because this router is the key router for LAN one to connect to the internet. I mean, if this router needs to send a packet to the internet, it must send the packet to this router, no matter what. There is no other option. Right, and you can think of, this link is the connection of land one to the internet. And if this link is cut somehow, the devices in land one cannot access the internet. It's that simple. After this point things will Show more

Show less
to discuss how a packet moves over the internet In this way you will understand how to devices in different countries communicate with each other will see this on an example. Let's say this computer in LAN one was to communicate with this computer in Atlanta. Okay, In other words, let's assume that this computer first to send a special pack et to this computer. So this packet must go to this router to exit from the land one. You know, because our destination is the art of land one. I mean it is a different network. Our destination is Atlanta and we can set our packet over the Internet to land. And now we are going to do this exactly. First, this computer sends the packet to the switch. After the switch receives the packet, this switch looks at the destination address of the packet and understand that it has to send the packet to the router. And after the raw to receive the packet, Reuter looks at the content of it and learns his destination address. Hence it understand that it must send the packet to the internet because the destination of the packet is in a different network than LAN one. So router must start the packet to this router that is connected, because this router is the key router for LAN one to connect to the internet. I mean, if this router needs to send a packet to the internet, it must send the packet to this router, no matter what. There is no other option. Right, and you can think of, this link is the connection of land one to the internet. And if this link is cut somehow, the devices in land one cannot access the internet. It's that simple. After this point things will

Choose the best path for the packet.

get a little complicated. So please listen to me very carefully. After packet reaches this router, the packet has three options to go: this path, this path or this path, right? This is obvious. But the question is which path is better option to go for the packet? And in order to answer this question, first we need to discuss what what the table is. Each router must Show more

Show less
get a little complicated. So please listen to me very carefully. After packet reaches this router, the packet has three options to go: this path, this path or this path, right? This is obvious. But the question is which path is better option to go for the packet? And in order to answer this question, first we need to discuss what what the table is. Each router must

Routers use routing tables to determine the path to forward packets based on destination information.

have a special table inside, called routing table. And after receiving a packet, a router looks at its routing table to learn which path it must send the packet. For this router it should be this path, this path or this path, right? This is obvious. And if you're aware, firstly, draw to receives the packet from one of its ports. I hope that you can imagine all these cables that come to the router are plugged into a port on the router And after the raw to receive the packet rotor learns the destination of the packet and sends the packet to an appropriate port according to the information on the routing table And we call this operation forwarding is the result every router needs to look at its routing table to learn which part it must forwards the packet In other words we can easily understand that routing tables need to have information that which part a packet will got okay It is very important to know this fundamental task of the rhotic table Each router has a special processor And information in the routing table is Show more

Show less
have a special table inside, called routing table. And after receiving a packet, a router looks at its routing table to learn which path it must send the packet. For this router it should be this path, this path or this path, right? This is obvious. And if you're aware, firstly, draw to receives the packet from one of its ports. I hope that you can imagine all these cables that come to the router are plugged into a port on the router And after the raw to receive the packet rotor learns the destination of the packet and sends the packet to an appropriate port according to the information on the routing table And we call this operation forwarding is the result every router needs to look at its routing table to learn which part it must forwards the packet In other words we can easily understand that routing tables need to have information that which part a packet will got okay It is very important to know this fundamental task of the rhotic table Each router has a special processor And information in the routing table is

Router uses algorithms to determine packet forwarding path.

created by this special processor using many different algorithms These algorithms determine the path that's a packet mascar And the results of these algorithms are added to the routing table Okay is the result This router will look at its routing table or learn which path the packet must be forwarded one two or three Meanwhile when a router makes this decision it always ignores the path that the packet came from because it makes no sense to forward the packet back the way it came from Right And let's say according to the routing table of this router the Show more

Show less
created by this special processor using many different algorithms These algorithms determine the path that's a packet mascar And the results of these algorithms are added to the routing table Okay is the result This router will look at its routing table or learn which path the packet must be forwarded one two or three Meanwhile when a router makes this decision it always ignores the path that the packet came from because it makes no sense to forward the packet back the way it came from Right And let's say according to the routing table of this router the

Packet forwarding is determined by the routing table on each router.

packet must be forwarded over path tree And there we go After that this router needs to look at its routing table to decide Which paths the packet mascot Assume that ting table save, the packet must be forwarded over patter, So the packet will go to this route, right, And there we go. If you are aware, the event is always the same And it will continue to be the same in every router until the packet reaches lanter. Anyway, let's get going very left off. This router must look at its routing table to determine which path the packet will be forwarded. Let's say, router choose patwon, So the packet will go to this route right. Wonderful, And at this moment, please listen to me very carefully, because there is a tricky part here. Show more

Show less
packet must be forwarded over path tree And there we go After that this router needs to look at its routing table to decide Which paths the packet mascot Assume that ting table save, the packet must be forwarded over patter, So the packet will go to this route, right, And there we go. If you are aware, the event is always the same And it will continue to be the same in every router until the packet reaches lanter. Anyway, let's get going very left off. This router must look at its routing table to determine which path the packet will be forwarded. Let's say, router choose patwon, So the packet will go to this route right. Wonderful, And at this moment, please listen to me very carefully, because there is a tricky part here.

Routers prioritize fastest delivery of packets to their destination.

When you look at the packets for the current position of the packet, you probably think of the most reasonable option as pactor, Because the shortest path to be able to access this router that is connected to this router seems to be patter. Right, And if we choose path one, for example, we have to go to this router first. From here we can go to this route. Or if we choose path three, we will go to this router first And from here we can go to this router. Similarly, But if we choose path two, we can go directly to this router, And this is what we want. But is this really the case? Let's see together. First of all, never forget that routers always want to deliver the packet to its destination as fast as possible. So Show more

Show less
When you look at the packets for the current position of the packet, you probably think of the most reasonable option as pactor, Because the shortest path to be able to access this router that is connected to this router seems to be patter. Right, And if we choose path one, for example, we have to go to this router first. From here we can go to this route. Or if we choose path three, we will go to this router first And from here we can go to this router. Similarly, But if we choose path two, we can go directly to this router, And this is what we want. But is this really the case? Let's see together. First of all, never forget that routers always want to deliver the packet to its destination as fast as possible. So

Routers use complex algorithms to create routing tables.

if this router chooses path three instead of patter, it may seem unreasonable to you at the beginning. I understand that, because you decide with a very simple logic. You are just using your eyes. However, routers use many algorithms when creating the routing tables And these algorithms have many variables. I mean routers have to take into account many situations when they are creating routing tables. For example, let's call, every router is a point in this structure, okay, So when routers create the routing tables, they are not only concerned with the number of points when Show more

Show less
if this router chooses path three instead of patter, it may seem unreasonable to you at the beginning. I understand that, because you decide with a very simple logic. You are just using your eyes. However, routers use many algorithms when creating the routing tables And these algorithms have many variables. I mean routers have to take into account many situations when they are creating routing tables. For example, let's call, every router is a point in this structure, okay, So when routers create the routing tables, they are not only concerned with the number of points when

Choosing the shortest route is crucial for efficient traffic control.

choosing the shortest route to the destination. This is really, really important. And I want to give an example to you to understand this subject better. In some, cases. Routers control the traffic of the links they are connected to, And if a path is still busy in terms of packet density, rotor will not set the packet over that part. I mean, for instance, there may be an excessive density on the path to line even if it seems the best option Okay And syst Road who knows this line is too busy that creating its routing table it may decide that it is more convenient set the packet or pantry instead of Patra And we call this situation congestion control Okay I think that I could get to the point As a result the router says the packet Show more

Show less
choosing the shortest route to the destination. This is really, really important. And I want to give an example to you to understand this subject better. In some, cases. Routers control the traffic of the links they are connected to, And if a path is still busy in terms of packet density, rotor will not set the packet over that part. I mean, for instance, there may be an excessive density on the path to line even if it seems the best option Okay And syst Road who knows this line is too busy that creating its routing table it may decide that it is more convenient set the packet or pantry instead of Patra And we call this situation congestion control Okay I think that I could get to the point As a result the router says the packet

The internet is a network of networks, connecting devices worldwide and allowing for fast communication and information exchange.

over pantry And here we go As you can see the number of points that the packet went through has increased However with the selection of path three the packet can probably reach its destination faster Don't forget this And after this moment let the packet go to this right and there we go And this router knows that the packet will go to the lamp and it sends the packet to the router in the half Okay by the way you can think of this line is a straight line like that And this router knows that the packet came to this computer So it sends the packet to the related computer Wonderful As you can see two devices located in this study areas basically communicate with each other Thanks to the internet we can communicate in milliseconds with a device on the other side of the belt text to the internet I'm talking about milliseconds guys this is a huge thing And 's the main reason of why the internet is one of the most important things that mankind created. I hope I was able to explain intuitively what the internet represents. However, there is also something else very important that I have to say. I want to tell you the bookish definition of the internet. The internet is the network of networks. Let me repeat: the internet is the network of networks. I believe that you got this, but I would like to make this definition more meaningful to you. Firstly, Think about your own heart. Maybe you have a lot of devices that can connect to the internet, for example, computers, mobile phones, televisions, game consoles, tablets and many, many more. Similarly, most people have many devices with an internet connection in their home, just like you, right. In the same way, you can think about a company or an enterprise that has a huge number of devices, And you know that there are many companies and enterprises in all over the world. So, as you notice, there are many small or medium sized labs spread all over developed, And all these lands on the visual represent these networks. As a result, the combination of all these networks stand for the internet itself. This is very important. The combination of all Show more

Show less
over pantry And here we go As you can see the number of points that the packet went through has increased However with the selection of path three the packet can probably reach its destination faster Don't forget this And after this moment let the packet go to this right and there we go And this router knows that the packet will go to the lamp and it sends the packet to the router in the half Okay by the way you can think of this line is a straight line like that And this router knows that the packet came to this computer So it sends the packet to the related computer Wonderful As you can see two devices located in this study areas basically communicate with each other Thanks to the internet we can communicate in milliseconds with a device on the other side of the belt text to the internet I'm talking about milliseconds guys this is a huge thing And 's the main reason of why the internet is one of the most important things that mankind created. I hope I was able to explain intuitively what the internet represents. However, there is also something else very important that I have to say. I want to tell you the bookish definition of the internet. The internet is the network of networks. Let me repeat: the internet is the network of networks. I believe that you got this, but I would like to make this definition more meaningful to you. Firstly, Think about your own heart. Maybe you have a lot of devices that can connect to the internet, for example, computers, mobile phones, televisions, game consoles, tablets and many, many more. Similarly, most people have many devices with an internet connection in their home, just like you, right. In the same way, you can think about a company or an enterprise that has a huge number of devices, And you know that there are many companies and enterprises in all over the world. So, as you notice, there are many small or medium sized labs spread all over developed, And all these lands on the visual represent these networks. As a result, the combination of all these networks stand for the internet itself. This is very important. The combination of all

The internet is a vast network connecting electronic devices worldwide.

these networks stands for the internet itself. In other words, we are talking about a huge system in which almost all electronic devices in the world used to communicate with each other. By the way, there is a very important part here to understand. On the visual. We call this the structure that is in the middle of the visual as the Internet, and you will see such a representation In many resources. You can usually see a club logo in order to represent the internet. But in fact, the internet is the spec structure you say, formed by a combination of all these networks and this structure in the middle. Okay, this is very crucial, guys. What I'm trying to say is, when you only see such a representation, you should think that there are Show more

Show less
these networks stands for the internet itself. In other words, we are talking about a huge system in which almost all electronic devices in the world used to communicate with each other. By the way, there is a very important part here to understand. On the visual. We call this the structure that is in the middle of the visual as the Internet, and you will see such a representation In many resources. You can usually see a club logo in order to represent the internet. But in fact, the internet is the spec structure you say, formed by a combination of all these networks and this structure in the middle. Okay, this is very crucial, guys. What I'm trying to say is, when you only see such a representation, you should think that there are

The internet is a network of networks, connecting millions of devices worldwide.

millions of ladders that are connected to it, even if these lands don't appear individual. Okay, And the internet is a huge system that includes all lands in the world. So I hope that you understand better. Reason have to bookish definition of the internet. The internet is the network of networks. Wonderful, And you can think of this attractor is the heart of the internet. For example, when we connect this land to the heart of the internet with this cable this LAN will be included in the internet and it can communicate other devices that are connected to the internet you catch the idea So far we have learned what the internet is and how important routers are But what exactly does connecting to the internet look like from a computer's perspective And we are going to discuss this question in the next lesson See you guys soon Bye Now we are going to discuss the meaning Show more

Show less
millions of ladders that are connected to it, even if these lands don't appear individual. Okay, And the internet is a huge system that includes all lands in the world. So I hope that you understand better. Reason have to bookish definition of the internet. The internet is the network of networks. Wonderful, And you can think of this attractor is the heart of the internet. For example, when we connect this land to the heart of the internet with this cable this LAN will be included in the internet and it can communicate other devices that are connected to the internet you catch the idea So far we have learned what the internet is and how important routers are But what exactly does connecting to the internet look like from a computer's perspective And we are going to discuss this question in the next lesson See you guys soon Bye Now we are going to discuss the meaning
Connecting to the internet from a computer's perspective

Connecting to the internet requires a home router, not a switch, when there is only one computer in the environment.

of connecting to the internet from the computer's perspective And I believe that it is very important to understand this event assume that we are in a home instead of an office and we have only one computer Therefore to be able to connect to the internet What we only need is a home router isn't it there is no need for a switch Since we don't have other devices to connect to each other in this home Wherever it by the way if you want we could use a router device instead of a home router device Because if you are aware we want to use only the router feature of the home router We t need to use the switch feature of the home router, right? Because there is only one computer in the environment. I believe currently you know which device actually does what. This should be logical to you. Therefore, I will assume that you know what basic networking devices are doing from now on, And so far, you have learned that the connection situation of the internet is determined by whether related computer can send a packet to the internet or not. And now I will try to make this situation more meaningful to you. You are watching this video on the udemycom website, Right? I mean, let's say you are turning on your computer and en tering udemycom on your favorite web browser. Then you click on the video you are watching right now or any video you want to watch, And as soon as you click on one of these videos, your computer creates a packet and says this packet to udemycom over the internet. The packet first ly is sent to home router And then the home router says the packet is To udemycom over the Internet and we can think of this green packet as your request message to use. Thecom request message gives information to udemycom about you want to watch the related video. Okay, this is very Show more

Show less
of connecting to the internet from the computer's perspective And I believe that it is very important to understand this event assume that we are in a home instead of an office and we have only one computer Therefore to be able to connect to the internet What we only need is a home router isn't it there is no need for a switch Since we don't have other devices to connect to each other in this home Wherever it by the way if you want we could use a router device instead of a home router device Because if you are aware we want to use only the router feature of the home router We t need to use the switch feature of the home router, right? Because there is only one computer in the environment. I believe currently you know which device actually does what. This should be logical to you. Therefore, I will assume that you know what basic networking devices are doing from now on, And so far, you have learned that the connection situation of the internet is determined by whether related computer can send a packet to the internet or not. And now I will try to make this situation more meaningful to you. You are watching this video on the udemycom website, Right? I mean, let's say you are turning on your computer and en tering udemycom on your favorite web browser. Then you click on the video you are watching right now or any video you want to watch, And as soon as you click on one of these videos, your computer creates a packet and says this packet to udemycom over the internet. The packet first ly is sent to home router And then the home router says the packet is To udemycom over the Internet and we can think of this green packet as your request message to use. Thecom request message gives information to udemycom about you want to watch the related video. Okay, this is very

Udemy streams videos to you piece by piece for uninterrupted viewing.

crucial. And after udemycom receives your request message about watching a specific video, it's natural ly realizes that you want to watch every year, hands you the muscles the related video to you over the internet. And there we go. These red Packers represent the pieces of the video that you may sell to you, In other words, the video you are watching right now. By the way, there is a very important thing about this process. Let me explain. While you are watching any video on Udemy, Udemy sells it to you piece by piece, And we call this process streaming. I think you have heard of this concept before And with the help of streaming technology, you can most videos un interruptedly are without any problem. And to be able to solve this piece by piece sunning process better, Now I have opened a random video on udemycom. You can see that the video is being Show more

Show less
crucial. And after udemycom receives your request message about watching a specific video, it's natural ly realizes that you want to watch every year, hands you the muscles the related video to you over the internet. And there we go. These red Packers represent the pieces of the video that you may sell to you, In other words, the video you are watching right now. By the way, there is a very important thing about this process. Let me explain. While you are watching any video on Udemy, Udemy sells it to you piece by piece, And we call this process streaming. I think you have heard of this concept before And with the help of streaming technology, you can most videos un interruptedly are without any problem. And to be able to solve this piece by piece sunning process better, Now I have opened a random video on udemycom. You can see that the video is being

Videos can be sent piece by piece, allowing us to watch them before they fully download.

sent to my computer from udemycom piece by piece. Thanks to the ability to send videos piece by piece, we can most video without requirement for all the video to reach our computer. For example, imagine you want to watch a one hour video and assume that your internet speed is so slow If you couldn't watch this video before the whole video reached your computer it will be very bad for you right Fortunately the process doesn't work like that Okay And in addition this transmission time varies depending on the speed of our internet The first or our internet speed is the sooner the video will reach our computer It's that simple I hope in this way you have a better understanding of what these red packets are great is a result connecting to the Show more

Show less
sent to my computer from udemycom piece by piece. Thanks to the ability to send videos piece by piece, we can most video without requirement for all the video to reach our computer. For example, imagine you want to watch a one hour video and assume that your internet speed is so slow If you couldn't watch this video before the whole video reached your computer it will be very bad for you right Fortunately the process doesn't work like that Okay And in addition this transmission time varies depending on the speed of our internet The first or our internet speed is the sooner the video will reach our computer It's that simple I hope in this way you have a better understanding of what these red packets are great is a result connecting to the

The internet relies on packet transmission and powerful servers to connect and communicate with computers worldwide, ensuring reliability and load balancing.

internet refers to you can send some packets to the Internet and you can receive some packets from the internet And here the water or home router in this situation plays a very important role The home router gives the packets it receives from the computer to the Internet and gives the packets it receives from the internet to the computer In summary packet transmission is the basis of connecting to the internet or communicating with a computer on the other side of the world Mean while when we enter udemycom we communicate with very powerful computers that actually belong to the ude mycom And we call these special computers server servers do not differ fundamentally from normal computers However since the servers will exchange packets with 1000s of normal computers at the same time, servers must be much more powerful computers in terms of hardware compared to normal computers Because, as you know, too many people access udemycom at the same time. I mean too many people access servers of udemycom at the same time, And at this moment, let me tell you what I mean when I say servers. After you demand, if you remember, we talked about the importance of the single point of failure and load balancing before, And this is true for servers a few Demeter. There is not a single Udemy server in the world. U demy has a lot of servers distributed around different parts of the world. The location of one of these servers is the best for you and you communicate with this best suited server. It's that simple is the result. When you want to enter udemycom, you are actually communicating with one of the suitable Udemy servers for you. So, while some of you communicate with the same server, some of you will communicate with a different server, But at the end of the day, you will all get the same content. Therefore, takes the distributed servers, Udemy prevents single point of failure and provide load balancing. Please think about it, lol, Okay, By the way, of course, there are many details behind the transmission of packets, But you can think of it in this way is the simplest logic, and That's all I need to say in this lesson. See you guys soon Bye. In this lesson we will Show more

Show less
internet refers to you can send some packets to the Internet and you can receive some packets from the internet And here the water or home router in this situation plays a very important role The home router gives the packets it receives from the computer to the Internet and gives the packets it receives from the internet to the computer In summary packet transmission is the basis of connecting to the internet or communicating with a computer on the other side of the world Mean while when we enter udemycom we communicate with very powerful computers that actually belong to the ude mycom And we call these special computers server servers do not differ fundamentally from normal computers However since the servers will exchange packets with 1000s of normal computers at the same time, servers must be much more powerful computers in terms of hardware compared to normal computers Because, as you know, too many people access udemycom at the same time. I mean too many people access servers of udemycom at the same time, And at this moment, let me tell you what I mean when I say servers. After you demand, if you remember, we talked about the importance of the single point of failure and load balancing before, And this is true for servers a few Demeter. There is not a single Udemy server in the world. U demy has a lot of servers distributed around different parts of the world. The location of one of these servers is the best for you and you communicate with this best suited server. It's that simple is the result. When you want to enter udemycom, you are actually communicating with one of the suitable Udemy servers for you. So, while some of you communicate with the same server, some of you will communicate with a different server, But at the end of the day, you will all get the same content. Therefore, takes the distributed servers, Udemy prevents single point of failure and provide load balancing. Please think about it, lol, Okay, By the way, of course, there are many details behind the transmission of packets, But you can think of it in this way is the simplest logic, and That's all I need to say in this lesson. See you guys soon Bye. In this lesson we will
Wide Area Network (WAN)

A Wide Area Network (WAN) connects distant offices of a company to create a special network.

shortly talk about the white area network, or, briefly, van, which is a very important type of network for the internet. In a simple manner you can think of. Van is a network consisting of a combination of different plants. For example, with the combination of these two lands, we can create a van or combination of this land, this land and this lesson. We can create another van. Okay, And in order to understand better the logical van, we can talk about the company example. Let's say, we have a growing company and reopened some offices in different parts of the world And we want these offices to be in the same network, even if they are far apart. And this is where the wide area network comes into play. By using van, we can create a special network for our requirements. Let's say this is one of our land And this is our another land And they are located in different parts of the world And we want to create a van for our company by using these two lands But the question is how do we do that Let's see Let's say our boss wants us to Show more

Show less
shortly talk about the white area network, or, briefly, van, which is a very important type of network for the internet. In a simple manner you can think of. Van is a network consisting of a combination of different plants. For example, with the combination of these two lands, we can create a van or combination of this land, this land and this lesson. We can create another van. Okay, And in order to understand better the logical van, we can talk about the company example. Let's say, we have a growing company and reopened some offices in different parts of the world And we want these offices to be in the same network, even if they are far apart. And this is where the wide area network comes into play. By using van, we can create a special network for our requirements. Let's say this is one of our land And this is our another land And they are located in different parts of the world And we want to create a van for our company by using these two lands But the question is how do we do that Let's see Let's say our boss wants us to

Create a network to connect different offices.

establish a special network for these lands I mean he wants the computers in these two different offices to work as if they are in the same environment So our guy is van if we create a van these lads can communicate as if they're in the same environment But there's an important point to consider here Thanks to the internet we can already enable these last two communicate right If you know the internet stands for the network of networks This means that the Show more

Show less
establish a special network for these lands I mean he wants the computers in these two different offices to work as if they are in the same environment So our guy is van if we create a van these lads can communicate as if they're in the same environment But there's an important point to consider here Thanks to the internet we can already enable these last two communicate right If you know the internet stands for the network of networks This means that the

Internet connects computers globally, but a special network like a van is needed for company communication.

internet itself represents connecting millions of flats together Hence if these last are already connected to the internet computers in land one and computers in land two can already communicate over the internet This is obvious sir the question is if these offices can already communicate with each other over the internet why we need another special network is a van Please be careful communication over the internet directly And communication over a special van belongs to a company is a whole different tank So I want you to think about that question for a short time and try to answer it Show more

Show less
internet itself represents connecting millions of flats together Hence if these last are already connected to the internet computers in land one and computers in land two can already communicate over the internet This is obvious sir the question is if these offices can already communicate with each other over the internet why we need another special network is a van Please be careful communication over the internet directly And communication over a special van belongs to a company is a whole different tank So I want you to think about that question for a short time and try to answer it

Internet is public, prone to security issues, hackers are everywhere.

If you have noticed, the internet is a public network. I mean the internet has no owner and it belongs to everyone. Any person can connect to the internet whenever and wherever he wants. For this reason, it is obvious that this public and huge network can have security related problems in information transfer between different locations. You know, hackers are everywhere and they are in this public and huge network. And to be able to answer the question I just asked better, I want to give you a very good example. Let's say, this computer wants to send an important file related to the company to this computer And Show more

Show less
If you have noticed, the internet is a public network. I mean the internet has no owner and it belongs to everyone. Any person can connect to the internet whenever and wherever he wants. For this reason, it is obvious that this public and huge network can have security related problems in information transfer between different locations. You know, hackers are everywhere and they are in this public and huge network. And to be able to answer the question I just asked better, I want to give you a very good example. Let's say, this computer wants to send an important file related to the company to this computer And

Sending files within a private network is secure, but sending over the internet poses risks.

after the file is sent to this computer, there will be no problem Because this transmission process took place within this land. This land is a private network for this office. An outsider cannot read, access this land without your permission. This is very important, Hence file transmission operation in this land is a secure operation in general. Everything is good so far. But what will happen if this file was sent to the other office over the internet? Let's see Now. The scenario is the same again, we need to send a file related to the company, but this time we must send this file to the other office of the company. As we can see, the file persists through the public network, isn't it? And this is where the problems appear. Just think about it. This part of the internet is an absolute public network. This means that if you sell the Show more

Show less
after the file is sent to this computer, there will be no problem Because this transmission process took place within this land. This land is a private network for this office. An outsider cannot read, access this land without your permission. This is very important, Hence file transmission operation in this land is a secure operation in general. Everything is good so far. But what will happen if this file was sent to the other office over the internet? Let's see Now. The scenario is the same again, we need to send a file related to the company, but this time we must send this file to the other office of the company. As we can see, the file persists through the public network, isn't it? And this is where the problems appear. Just think about it. This part of the internet is an absolute public network. This means that if you sell the

Sending files over the internet without protection can lead to unauthorized access or tampering; using a VPN creates a secure tunnel for privacy, anonymity, and data encryption.

file over the internet like that, there is no guarantee that no one from the outside sight can't see this file or, worst, no one from the outside can change this file. As I said before, hackers are everywhere and the possibility of these issues are generally not low. Hence, it is important to remember that there is a possibility for a problem when you send this file about the company over the internet directly, especially if it is a very important file about the company. It is very vital to be careful, and a special man for the company is a solution to such problems In general. Setting up a van is a costly and not easy task, But fortunately there are various methods of setting up a van, And now we will only talk about the most popular and cost effective van methods, and this method is van by using VPN. I am sure that you have heard of VPN before. It stands for virtual private network, And people usually use VPN to access restricted websites because we pn ensures our anonymity and it encrypts our data before sending the packet Hance This gives us high security in general And while creating grants by using VPN technology we take advantage of these features of VPN But the most important feature you should know about VPN is the tunneling This feature of VPN provides privacy and anonymity and security to us by creating a special network connection over a public network This is really really important I want to repeat this again VPN tunnel link provides privacy anonymity and Security Trust by creating a special network connection over a public network However frankly speaking a physical tunnel isn't created here This is very crucial tunneling technology makes the packet acts as if it is going through a physical tunnel But I won't repeat it Again this is not a physical tunnel This tunnel visual just represents the high security connection between land one and lanter You can think of it in this way This tunnel visual just stands for the high security for the connection between these routers It's that simple the way, of course, the packet will pass through many routers on the internet in order to reach its destination, just as you have learned before. However, since VPN uses tunneling, it will be almost impossible to interfere with this packet from the outside. Great, I hope Show more

Show less
file over the internet like that, there is no guarantee that no one from the outside sight can't see this file or, worst, no one from the outside can change this file. As I said before, hackers are everywhere and the possibility of these issues are generally not low. Hence, it is important to remember that there is a possibility for a problem when you send this file about the company over the internet directly, especially if it is a very important file about the company. It is very vital to be careful, and a special man for the company is a solution to such problems In general. Setting up a van is a costly and not easy task, But fortunately there are various methods of setting up a van, And now we will only talk about the most popular and cost effective van methods, and this method is van by using VPN. I am sure that you have heard of VPN before. It stands for virtual private network, And people usually use VPN to access restricted websites because we pn ensures our anonymity and it encrypts our data before sending the packet Hance This gives us high security in general And while creating grants by using VPN technology we take advantage of these features of VPN But the most important feature you should know about VPN is the tunneling This feature of VPN provides privacy and anonymity and security to us by creating a special network connection over a public network This is really really important I want to repeat this again VPN tunnel link provides privacy anonymity and Security Trust by creating a special network connection over a public network However frankly speaking a physical tunnel isn't created here This is very crucial tunneling technology makes the packet acts as if it is going through a physical tunnel But I won't repeat it Again this is not a physical tunnel This tunnel visual just represents the high security connection between land one and lanter You can think of it in this way This tunnel visual just stands for the high security for the connection between these routers It's that simple the way, of course, the packet will pass through many routers on the internet in order to reach its destination, just as you have learned before. However, since VPN uses tunneling, it will be almost impossible to interfere with this packet from the outside. Great, I hope

Tunneling is a method of creating a secure connection between routers, similar to putting a letter in an envelope, but encryption is needed for added security.

that you get the tunneling conceptually, but I want to take a closer look at it. So first we start our file to the right And there we go, And at this moment there will be some changes on the pack et. But before doing these changes, first of all you should know that VPN tunneling is set up between these routers. This is very crucial, And we call this site to site VPN. This method is very popular. While creating a van between offices and take the tunneling, our file safe reaches lanter, You know. But the question is if tunneling is not a physical tunnel as shown in the picture, what exactly is it? Let's see. I will use an analogy To explain this. Let's say you need to send a letter from land one to lanter, So you should give the letter you wrote to a postman, right? The postman can take this letter to its destination And suppose you are not putting this letter in an envelope. This means that the postman can read the letter if he wants. This is obvious. You can think of the postman in this example is the public Internet. On the other hand, if you had put this letter in an envelope first and gave it to the postman in this way, the postman wouldn't be able to read it. This is obvious. Hence the process of putting the letter in an envelope represents the tunneling itself. So in the real scenario, we had to put this yellow pack et into another packet, And there we go. Assume that the yellow packet is in the red packet is just like putting glitter in an envelope. That's the whole idea about tunneling wanderful. And in this moment I want to ask you a question, And my question is that: is this packet really in safe right now? I mean, kept the postman open the envelope and find out the information in it If he really wants to just think about it? He got the point right Even though We have increased the security of the packet by applying tunneling, there are still some problems. And this is where encryption comes into play. Suppose that you encrypt your letter in a way that only people Show more

Show less
that you get the tunneling conceptually, but I want to take a closer look at it. So first we start our file to the right And there we go, And at this moment there will be some changes on the pack et. But before doing these changes, first of all you should know that VPN tunneling is set up between these routers. This is very crucial, And we call this site to site VPN. This method is very popular. While creating a van between offices and take the tunneling, our file safe reaches lanter, You know. But the question is if tunneling is not a physical tunnel as shown in the picture, what exactly is it? Let's see. I will use an analogy To explain this. Let's say you need to send a letter from land one to lanter, So you should give the letter you wrote to a postman, right? The postman can take this letter to its destination And suppose you are not putting this letter in an envelope. This means that the postman can read the letter if he wants. This is obvious. You can think of the postman in this example is the public Internet. On the other hand, if you had put this letter in an envelope first and gave it to the postman in this way, the postman wouldn't be able to read it. This is obvious. Hence the process of putting the letter in an envelope represents the tunneling itself. So in the real scenario, we had to put this yellow pack et into another packet, And there we go. Assume that the yellow packet is in the red packet is just like putting glitter in an envelope. That's the whole idea about tunneling wanderful. And in this moment I want to ask you a question, And my question is that: is this packet really in safe right now? I mean, kept the postman open the envelope and find out the information in it If he really wants to just think about it? He got the point right Even though We have increased the security of the packet by applying tunneling, there are still some problems. And this is where encryption comes into play. Suppose that you encrypt your letter in a way that only people

Using VPNs allows for secure transmission of encrypted data packets over the internet, maximizing security but not guaranteeing 100% protection.

working in your company can understand In this case even if the postman opens the envelope he cannot obtain the information because he will see none understandable data he will not understand the encrypted information So what we have to do is very simple right we must encrypt the original packet before putting it into another packet So let me back one step on Dynamesh And for this scenario we encrypt the yellow packet before putting it in the red packet And then we put this encrypted packet into the red packet Now finally this packet is sent to them to over the internet safely And there we go It's that simple guys We encrypted the origin of packets and put it in another packet Thus we maximized the security of the pact okay The term of tunneling comes from here because packet is safe is if it was moving in your own private tunnel I hope that I made this concept understandable to you And at this moment the writer needs to get the original packet And to be able to do this router first eliminates the outside packed right and then it needs to decrypt the encrypted packet so that it cannot be in the original packet And after the router gets the original packet it looks inside the packet and loves his destination and says the packet to his destination. And there we go is the result. With the help of the van, By using VPN, we can securely search company related information from one LAN to another. But never forget that there is no such thing as 100% security. This means there may be always a security vulnerability Show more

Show less
working in your company can understand In this case even if the postman opens the envelope he cannot obtain the information because he will see none understandable data he will not understand the encrypted information So what we have to do is very simple right we must encrypt the original packet before putting it into another packet So let me back one step on Dynamesh And for this scenario we encrypt the yellow packet before putting it in the red packet And then we put this encrypted packet into the red packet Now finally this packet is sent to them to over the internet safely And there we go It's that simple guys We encrypted the origin of packets and put it in another packet Thus we maximized the security of the pact okay The term of tunneling comes from here because packet is safe is if it was moving in your own private tunnel I hope that I made this concept understandable to you And at this moment the writer needs to get the original packet And to be able to do this router first eliminates the outside packed right and then it needs to decrypt the encrypted packet so that it cannot be in the original packet And after the router gets the original packet it looks inside the packet and loves his destination and says the packet to his destination. And there we go is the result. With the help of the van, By using VPN, we can securely search company related information from one LAN to another. But never forget that there is no such thing as 100% security. This means there may be always a security vulnerability

VPN networks are secure and budget-friendly for all systems.

for every system. However, currently Van networks built by using VPN technology are quite satisfactory in terms of both budget and sacred. Okay, I believe everything is good so far. But some of you curious can think about equation. You probably think like I constantly use the internet in daily life. I sent mail to my friends, I use e commerce website and I do all of these over the internet. So, since the internet is a public network, are all these operations insecure? The answer is both Yes, And now let me explain. Assume that Show more

Show less
for every system. However, currently Van networks built by using VPN technology are quite satisfactory in terms of both budget and sacred. Okay, I believe everything is good so far. But some of you curious can think about equation. You probably think like I constantly use the internet in daily life. I sent mail to my friends, I use e commerce website and I do all of these over the internet. So, since the internet is a public network, are all these operations insecure? The answer is both Yes, And now let me explain. Assume that

Encryption ensures that only the intended recipient can access sensitive information, protecting it from hackers and ensuring secure transactions.

you want to make an operation on amazoncom And let's say you had to enter some information about your credit card While purchasing a product says this information will be sent as a packet over the Internet to one of the servers of amazoncom. We absolutely don't want anyone from the outside to see the information about our credit card. Is a solution to this? And add to add, encryption method is used between our computer and the destination server And since the packet is encrypted, nobody from the outside can see the information about our credit cards, except the server of amazoncom. This is the main logic behind the answer and encryption. All of the endpoints can decrypt the packet and obtain to original data. Okay, However, this kind of encryption was not used in the past And this situation made it easy for hackers. Imagine that the information about your credit card was directly obtained by a hacker in pure text. This is terrible, right, But text to add to add, encryption. We eliminate this problem. And finally, I'm going to ask you a question And then I'm going to finish the lesson. Now, you know what when is right? In summary, van repossessed the networks we create by combining different plans in this case, My question is: what is the largest wide area network in the world? The answer comes to your mind rapidly, isn't it? The internet itself is the largest wide area network in the world. However, I want to remind you again, please note that a company's van created with VPN is different from the internet While one of these vans is completely special to the company The internet is owned by everyone in the world And yeah that's all I will say about Ron See you guys soon We have learned a lot of Show more

Show less
you want to make an operation on amazoncom And let's say you had to enter some information about your credit card While purchasing a product says this information will be sent as a packet over the Internet to one of the servers of amazoncom. We absolutely don't want anyone from the outside to see the information about our credit card. Is a solution to this? And add to add, encryption method is used between our computer and the destination server And since the packet is encrypted, nobody from the outside can see the information about our credit cards, except the server of amazoncom. This is the main logic behind the answer and encryption. All of the endpoints can decrypt the packet and obtain to original data. Okay, However, this kind of encryption was not used in the past And this situation made it easy for hackers. Imagine that the information about your credit card was directly obtained by a hacker in pure text. This is terrible, right, But text to add to add, encryption. We eliminate this problem. And finally, I'm going to ask you a question And then I'm going to finish the lesson. Now, you know what when is right? In summary, van repossessed the networks we create by combining different plans in this case, My question is: what is the largest wide area network in the world? The answer comes to your mind rapidly, isn't it? The internet itself is the largest wide area network in the world. However, I want to remind you again, please note that a company's van created with VPN is different from the internet While one of these vans is completely special to the company The internet is owned by everyone in the world And yeah that's all I will say about Ron See you guys soon We have learned a lot of
What is the Router? (Part-2)

Switches can be directly connected to create a LAN, even if they are in different environments, as long as the distance is short.

information about network devices until now And in this lesson we will look at a few more cases by using these devices Let's say we have two offices belongs to the same company And suppose that there are 100 meters between these offices If you are aware this distance is very short In this case what I'm wondering is whether. Or not we can connect switch one and switch two directly to each other to create a LAN And the answer is we can definitely do this because as you know that we use switches to create a class Therefore we can create a LAN by connecting these switches to each other even if they are not in the same environment But please note that the distance is very short between these offices If this distance were not too short it is impossible to connect these switches and create a LAN Meanwhile these types of lands can be called campus Area Network or briefly can since these types of networks are generally used on Show more

Show less
information about network devices until now And in this lesson we will look at a few more cases by using these devices Let's say we have two offices belongs to the same company And suppose that there are 100 meters between these offices If you are aware this distance is very short In this case what I'm wondering is whether. Or not we can connect switch one and switch two directly to each other to create a LAN And the answer is we can definitely do this because as you know that we use switches to create a class Therefore we can create a LAN by connecting these switches to each other even if they are not in the same environment But please note that the distance is very short between these offices If this distance were not too short it is impossible to connect these switches and create a LAN Meanwhile these types of lands can be called campus Area Network or briefly can since these types of networks are generally used on

VPN is more secure than LAN for connecting remote offices.

university campuses okay On the other hand you that we can also connect these two offices by using van, with VPN, But please note that when our LAN or different kinds of network types- this is important and you can see the packet sent with tunneling in the animation. And there we go. Yep, I believe. So far everything is good, But I want to ask you a question: Which one do you think is more secure? When? Which VPN or LAN created by connecting villages directly? Please think about that for a short time and try to answer it. The answer Show more

Show less
university campuses okay On the other hand you that we can also connect these two offices by using van, with VPN, But please note that when our LAN or different kinds of network types- this is important and you can see the packet sent with tunneling in the animation. And there we go. Yep, I believe. So far everything is good, But I want to ask you a question: Which one do you think is more secure? When? Which VPN or LAN created by connecting villages directly? Please think about that for a short time and try to answer it. The answer

A LAN is more secure than a van because packets in a LAN never pass over the internet, while packets in a van do, even with protection.

is source Simple, isn't it? A LAN is always more secure than a van Because, in the communication within the land, the packet never passes over the internet. The packet always moves on our own cable. On the other hand, even if the packet is protected in the van, the packet still persists over the internet And, as you know, there is never such a thing as 100% security, even if the packet is protected with tunnel link and encryption. So, to summarize, both of these methods are secure, But LAN is more secure. This is obvious. However, there is a condition. That event is almost a secure SLR, and we call private van for this type of fan. By the way, we haven't talked about this van type before. I mean, this is different from manmad VPN because the line between offices is dedicated for the company. You request this line from the ISP and give a special money for this line does. The ISP gives you a private line that only your company can use. We call the van created in this way his private van. Okay, And please remember that we were using public internet network environment VPN, And that's why we also call them. Each VPN is public van. This is very crucial. In addition, even if private van sounds great it the first glance, it can be quite costly. For this reason, it makes sense for an average company to prefer a public van instead of private van. You know public van provides us security that we definitely cannot underestimate, right, wonderful. Now I want you to pay attention to one point. Some of you may have already noticed this, but it will be good to mention. In any case, we will switch devices to create a LAN while we use routers to create a van. This is very vital. I want to repeat this again. We use switches to create a LAN while we use Rogers to create a van. This means we cannot create a van by using service devices Because a van fundamentally represents connection of different plans with the help of Van different glass can act as if they are in the same environment And you know that if you want to connect different plants we definitely need a router for this task He's got the point And now I want to talk a little bit about Show more

Show less
is source Simple, isn't it? A LAN is always more secure than a van Because, in the communication within the land, the packet never passes over the internet. The packet always moves on our own cable. On the other hand, even if the packet is protected in the van, the packet still persists over the internet And, as you know, there is never such a thing as 100% security, even if the packet is protected with tunnel link and encryption. So, to summarize, both of these methods are secure, But LAN is more secure. This is obvious. However, there is a condition. That event is almost a secure SLR, and we call private van for this type of fan. By the way, we haven't talked about this van type before. I mean, this is different from manmad VPN because the line between offices is dedicated for the company. You request this line from the ISP and give a special money for this line does. The ISP gives you a private line that only your company can use. We call the van created in this way his private van. Okay, And please remember that we were using public internet network environment VPN, And that's why we also call them. Each VPN is public van. This is very crucial. In addition, even if private van sounds great it the first glance, it can be quite costly. For this reason, it makes sense for an average company to prefer a public van instead of private van. You know public van provides us security that we definitely cannot underestimate, right, wonderful. Now I want you to pay attention to one point. Some of you may have already noticed this, but it will be good to mention. In any case, we will switch devices to create a LAN while we use routers to create a van. This is very vital. I want to repeat this again. We use switches to create a LAN while we use Rogers to create a van. This means we cannot create a van by using service devices Because a van fundamentally represents connection of different plans with the help of Van different glass can act as if they are in the same environment And you know that if you want to connect different plants we definitely need a router for this task He's got the point And now I want to talk a little bit about

Routers connect different networks, whether they are in different parts of the world or in the same office, allowing devices to communicate with each other.

ratar o until now I have always explained the router is an internet related device However it isn' t the main task of the router is to connect different networks That said you should realize that these networks may be in different parts of the world or maybe in the same office it really doesn't matter And in this slide you can see that two different plants in the same office are connected to each other thanks to the router device Suppose that one of these networks is related to the marketing unit of the company and the other relate to the software unit And as you know if we want different networks to communicate with each other we should use erasure in the animation you can see that land one Outland through communicate through Roger and there we go Great And here I want to give you additional information about Roger I want you to focus on cables of the router. If you are aware, each cable is connected to a different network. I mean, one of the cables is connected to LAN, one one of the cables is connected to and to, and one of the cables is connected to the internet. This is the case for the router. The router connects different networks, you know. For this reason, each cable connected to a port on the router represents a different network. Okay, By the way, you may have wondered why different networks are needed within the same office. As a matter of fact, this is a common situation in real life. I mean, you may want different units in the office to be in different networks. This might be absurd for an office suite for computers. However, imagine an office with 50 computers in it. Dividing these computers into units increases hierarchy and order, never forgot That is. You can see, the basic principles are the same everywhere. By using these basic principles, we can enable devices in different parts of the world to communicate And we can enable devices in the same office to communicate. Both of them represent the same task. I think you understand this concept very well And that's all I want to say in this lesson. See you guys soon. In one of our Show more

Show less
ratar o until now I have always explained the router is an internet related device However it isn' t the main task of the router is to connect different networks That said you should realize that these networks may be in different parts of the world or maybe in the same office it really doesn't matter And in this slide you can see that two different plants in the same office are connected to each other thanks to the router device Suppose that one of these networks is related to the marketing unit of the company and the other relate to the software unit And as you know if we want different networks to communicate with each other we should use erasure in the animation you can see that land one Outland through communicate through Roger and there we go Great And here I want to give you additional information about Roger I want you to focus on cables of the router. If you are aware, each cable is connected to a different network. I mean, one of the cables is connected to LAN, one one of the cables is connected to and to, and one of the cables is connected to the internet. This is the case for the router. The router connects different networks, you know. For this reason, each cable connected to a port on the router represents a different network. Okay, By the way, you may have wondered why different networks are needed within the same office. As a matter of fact, this is a common situation in real life. I mean, you may want different units in the office to be in different networks. This might be absurd for an office suite for computers. However, imagine an office with 50 computers in it. Dividing these computers into units increases hierarchy and order, never forgot That is. You can see, the basic principles are the same everywhere. By using these basic principles, we can enable devices in different parts of the world to communicate And we can enable devices in the same office to communicate. Both of them represent the same task. I think you understand this concept very well And that's all I want to say in this lesson. See you guys soon. In one of our
Internet Service Provider(ISP) (Part-1)

ISP is responsible for transmitting internet packets and controlling routers in the internet structure.

previous lessons, I told you we purchased this cable that came to our home from ISP, but I haven't mentioned what exactly ISP is, And in this lesson we are going to discuss what is the ISP and why it is so important. The internet service provider, or briefly, ISP, is responsible for the transmission of packets from one location to another. If you remember, we have learned that there are a lot of routers in the heart of the internet and talking about this structure And you can think of the ISP as the mechanism that controls all these routers in this structure, For example, there are actually many routers in this globalized. Similarly, there are many routers in this region. Last year, But, to simplify the concept, I didn't visually show routers within the ISP s. However, I want you to imagine that the routers distributed around the world are control led by these ISVs. This is very crucial. Think of it as of each ISP controls specific routers and Show more

Show less
previous lessons, I told you we purchased this cable that came to our home from ISP, but I haven't mentioned what exactly ISP is, And in this lesson we are going to discuss what is the ISP and why it is so important. The internet service provider, or briefly, ISP, is responsible for the transmission of packets from one location to another. If you remember, we have learned that there are a lot of routers in the heart of the internet and talking about this structure And you can think of the ISP as the mechanism that controls all these routers in this structure, For example, there are actually many routers in this globalized. Similarly, there are many routers in this region. Last year, But, to simplify the concept, I didn't visually show routers within the ISP s. However, I want you to imagine that the routers distributed around the world are control led by these ISVs. This is very crucial. Think of it as of each ISP controls specific routers and

Packets are sent between locations using routers controlled by ISPs.

packets are sent from one location to another location over these routers. We previously talked about how the packet travels from one point to another era others understanding this situation is the first condition to understand the ISP What I am trying to say is certainly S PS are responsible for certain routers I want you to imagine that every ISP you see in this picture is responsible for certain routers okay but I am removing them from the visual for the simplicity of the concept In addition the ISP model you see here is a simplified model But even if the model is simple it is enough to understand the most important parts of the concept Let's start with basic definition of the ISP ISP s represent companies that serve us so that Show more

Show less
packets are sent from one location to another location over these routers. We previously talked about how the packet travels from one point to another era others understanding this situation is the first condition to understand the ISP What I am trying to say is certainly S PS are responsible for certain routers I want you to imagine that every ISP you see in this picture is responsible for certain routers okay but I am removing them from the visual for the simplicity of the concept In addition the ISP model you see here is a simplified model But even if the model is simple it is enough to understand the most important parts of the concept Let's start with basic definition of the ISP ISP s represent companies that serve us so that

ISPs are necessary for internet connection.

we can connect to the internet And of course they charge a certain fee for this service You cannot connect to the internet without an ISP Think of ISP is the structure that allows you to connect to the internet and ISP is not a single structure There are hundreds of 1000s of ISVs in the world and all these isbs come together to form structure you see individual there is few ISP Show more

Show less
we can connect to the internet And of course they charge a certain fee for this service You cannot connect to the internet without an ISP Think of ISP is the structure that allows you to connect to the internet and ISP is not a single structure There are hundreds of 1000s of ISVs in the world and all these isbs come together to form structure you see individual there is few ISP

Local ISPs are responsible for small area communications and connect computers within a neighborhood.

individual I know that But I can say that there are hundreds of 1000s of ISP s in real life The most common ISP type in default is local ISP And now I want to start with it The first step of connecting to the internet is to communicate with the local SP, And local ISPs are generally responsible for small area communications, for example, the communications of two different plants in the same neighborhood or communication of less located in neighborhoods close to each other. Let's say, we live in the USA and these two homes are located in the same neighborhood. If this computer wants to communicate with this computer, the connection is provided directly over this local ISP. This is obvious. You can see this on the animation. The pack et passes through different routers at local ISP and reaches its destination. But in general, since the local ISP is responsible for the communication of small areas, the packet can also pass through all the one router before reaching its destination. You can think of this. Local ISP is the ISP that only connects lands within a neighborhood. Of course, a local ISP can connect different neighborhoods, But in this scenario, let's say it doesn't. Therefore one router can be enough to connect them. You got the point And in this visual Show more

Show less
individual I know that But I can say that there are hundreds of 1000s of ISP s in real life The most common ISP type in default is local ISP And now I want to start with it The first step of connecting to the internet is to communicate with the local SP, And local ISPs are generally responsible for small area communications, for example, the communications of two different plants in the same neighborhood or communication of less located in neighborhoods close to each other. Let's say, we live in the USA and these two homes are located in the same neighborhood. If this computer wants to communicate with this computer, the connection is provided directly over this local ISP. This is obvious. You can see this on the animation. The pack et passes through different routers at local ISP and reaches its destination. But in general, since the local ISP is responsible for the communication of small areas, the packet can also pass through all the one router before reaching its destination. You can think of this. Local ISP is the ISP that only connects lands within a neighborhood. Of course, a local ISP can connect different neighborhoods, But in this scenario, let's say it doesn't. Therefore one router can be enough to connect them. You got the point And in this visual

POPs are small ISP offices with routers and other devices for network configurations.

you can see an example of a small local ISP office And we call these offices Point of Pres ence, or briefly pop. In fact, effect routers distributed over the internet are included in these paths And in this fab, In other words, in this office, routers are on the left side. In addition, you have probably noticed that there are other devices than routers, because sometimes we must do different configurations with different devices. Hence EPA must save routers, switches, servers and so on. But the device we use to connect different networks to each other is the right, you know. For this reason we will only focus on routers, And in our previous lessons, Reuters on the internet Show more

Show less
you can see an example of a small local ISP office And we call these offices Point of Pres ence, or briefly pop. In fact, effect routers distributed over the internet are included in these paths And in this fab, In other words, in this office, routers are on the left side. In addition, you have probably noticed that there are other devices than routers, because sometimes we must do different configurations with different devices. Hence EPA must save routers, switches, servers and so on. But the device we use to connect different networks to each other is the right, you know. For this reason we will only focus on routers, And in our previous lessons, Reuters on the internet

Some local SBs have multiple paths for effective communication between different neighborhoods.

visual were actually representing paths separate over divulge. And in order to explain this better, I want to talk on a different image. But in this image I want to think of different houses and offices connected to local SB two and local SB three. I mean you both talk about the thoughts. You got the point. And there we go, As you can see, a home and small office connect to a pop over local SB saw. This pop is the first point to be able to connect to the internet for this home And this office. This should be clear to you. By the way, if you are aware, locally SB two has four paths you might think that takes to these four paths Locally SB two connects different neighborhoods And in this way lands in different neighborhoods can communicate over local SB two effectively And from here we can draw the following conclusion Some local asbs can have more than one path Show more

Show less
visual were actually representing paths separate over divulge. And in order to explain this better, I want to talk on a different image. But in this image I want to think of different houses and offices connected to local SB two and local SB three. I mean you both talk about the thoughts. You got the point. And there we go, As you can see, a home and small office connect to a pop over local SB saw. This pop is the first point to be able to connect to the internet for this home And this office. This should be clear to you. By the way, if you are aware, locally SB two has four paths you might think that takes to these four paths Locally SB two connects different neighborhoods And in this way lands in different neighborhoods can communicate over local SB two effectively And from here we can draw the following conclusion Some local asbs can have more than one path

Localized space can have multiple paths depending on its size, with local ISPs connecting neighborhoods and regional ISPs connecting cities within a country.

However some localized space can only have one path This depends on the size of the localized sphere For example if a local ISP connects four different neighborhoods it may have four different paths But if a local ISP connects all the one neighborhood it has all the vamp up you catch the idea And if you want to do more detailed studies on this topic you will see many resources on the internet with raw trackers you should be aware that these icons actually represent water within the pop There are many pops distributed all of our developers and routers are in these paths It's that simple At this moment I want you to imagine that there are hundreds of 1000s of local SPS in the world And these local SPS Connect regionally space that are larger than this means that different localized space communicate over regionalized space For example local SP to communicate with local SP three over the regional SP one As a matter of fact you can think of local asbs Connect neighborhoods and regional SPS Connect cities in a country. It's that simple. I want to repeat this again. You can think of localized space connect neighborhoods or small areas and regionally space Connect cities In a country. Okay, Meanwhile there is one regional SP in this simplified model we use, But in real life a country can have many regional airspace and all local SPS and regional SPS combined in order to create a network of a country. In summary, the first step to connecting to the internet is local ISP And this line represents the line we purchased from the local ISP right, every home or office must purchase such a line from the relevant ISP to connect to the internet. And if you examine your home router carefully, you can see the cable coming from your ISP. Wonderful. Now let's suppose that this computer Show more

Show less
However some localized space can only have one path This depends on the size of the localized sphere For example if a local ISP connects four different neighborhoods it may have four different paths But if a local ISP connects all the one neighborhood it has all the vamp up you catch the idea And if you want to do more detailed studies on this topic you will see many resources on the internet with raw trackers you should be aware that these icons actually represent water within the pop There are many pops distributed all of our developers and routers are in these paths It's that simple At this moment I want you to imagine that there are hundreds of 1000s of local SPS in the world And these local SPS Connect regionally space that are larger than this means that different localized space communicate over regionalized space For example local SP to communicate with local SP three over the regional SP one As a matter of fact you can think of local asbs Connect neighborhoods and regional SPS Connect cities in a country. It's that simple. I want to repeat this again. You can think of localized space connect neighborhoods or small areas and regionally space Connect cities In a country. Okay, Meanwhile there is one regional SP in this simplified model we use, But in real life a country can have many regional airspace and all local SPS and regional SPS combined in order to create a network of a country. In summary, the first step to connecting to the internet is local ISP And this line represents the line we purchased from the local ISP right, every home or office must purchase such a line from the relevant ISP to connect to the internet. And if you examine your home router carefully, you can see the cable coming from your ISP. Wonderful. Now let's suppose that this computer

Two homes in different cities in the USA with different ISPs need to communicate, and the regional service provider facilitates the connection.

and this computer want to communicate with each other. By the way, these two homes are located in the USA, but they are in different cities. As a result, they are connected to different local ISP. So this is our base. So in this situation, how will this local SV communicate with this local ISP? Let's say, in fact, this is where the regional SB one comes into play. In general, the regional SP is engaged in the communication of devices in the same Show more

Show less
and this computer want to communicate with each other. By the way, these two homes are located in the USA, but they are in different cities. As a result, they are connected to different local ISP. So this is our base. So in this situation, how will this local SV communicate with this local ISP? Let's say, in fact, this is where the regional SB one comes into play. In general, the regional SP is engaged in the communication of devices in the same

Local and regional ISPs communicate through a central hierarchical structure to minimize complexity.

countries but in different cities. If you look carefully at the animation, local asbs communicate over the region. Laceby is obvious, right, And there we go. And at this moment some of you may be wondering why there is no direct link from local SB two to local SB three. This is not expected question. Just think about it. If we connect, localize these directly, the hierarchy is broken. I mean, you see very few localized these in the scenario, but in real life there can be middleclass peace, even in the same city. And if we connect them all together, complexity will definitely occur And we don't want to increase the complexity of this system. It is already quite complex, isn't it? And that's why we use a central, hierarchical ISP structure is, you see, individual, with the minimum number of connections between ISP s. We ensure that all ISP is communica te with each other. It's that simple. So far. We have talked about the local ISP and regionalised. Show more

Show less
countries but in different cities. If you look carefully at the animation, local asbs communicate over the region. Laceby is obvious, right, And there we go. And at this moment some of you may be wondering why there is no direct link from local SB two to local SB three. This is not expected question. Just think about it. If we connect, localize these directly, the hierarchy is broken. I mean, you see very few localized these in the scenario, but in real life there can be middleclass peace, even in the same city. And if we connect them all together, complexity will definitely occur And we don't want to increase the complexity of this system. It is already quite complex, isn't it? And that's why we use a central, hierarchical ISP structure is, you see, individual, with the minimum number of connections between ISP s. We ensure that all ISP is communica te with each other. It's that simple. So far. We have talked about the local ISP and regionalised.

Global ISP connects devices in different countries.

Also, the computers that communicate with each other were always in the USA But what if computers in different countries want to communicate with each other And this is where the global SP comes into play you may think that the global ISP connects devices in different countries in general Show more

Show less
Also, the computers that communicate with each other were always in the USA But what if computers in different countries want to communicate with each other And this is where the global SP comes into play you may think that the global ISP connects devices in different countries in general

Global ISP required for communication between devices in USA and China.

is you know there is an ocean between the USA and China So if a device in the USA and a device in China wants to communicate it must be a global ISP that provides this connection you cannot connect these two devices with only local ISP and regional ISP And as you can see in the image there are