In this video we are going to start learning about basic computer network. 2
We are going to start from the very basic, 3
which is learning about what is computer network and the function of computer network 4
So what is computer network? In the simple term, 5
computer network is used to help us to share information between computer. 6
For example, here I have a picture of computer network. Here we can see that we have a laptop, 7
computer, printer, playstation, smartphone, and another computer 8
And we can see that all of these devices is connected to the router. Some devices connected 9
to the router using cable, and some another devices connected to the router using wifi. 10
After all of these devices connected to the router, now we have a computer 11
network here. And all of these devices now can share information each others. 12
So this is a computer network, to help us share information between computers. 13
Now let’s talk more about how computer network can help us 14
In the past, before computer network exists, 15
let’s say we have a room and in this room we have six computer. 16
For example all of this computer want to print in the same time, 17
before computer network exists, 18
if we want to print, we need to have a printer connected to our computer. 19
So if we have six computers like this, we will need six printers that connected to each computer. 20
We need a printer in computer 1, computer 2, 21
computer 3, computer 4, computer 5, and also we need a printer in computer 6 like this. 22
Now let’s imagine, we just have six computers right now, and we need six printers that 23
connected to each computers. How if we have 100 computers, so we will need 100 printers right? 24
This is absolutely not cost effective. 25
But now, with computer network, we don’t need to buy a printer for each computer. 26
We just need to have 1 printer that connected to computer network, and then all of computers can 27
print with this printer using computer network. Doesn’t matter if we have 10 computers, 28
50 computers, or even 100 computers, we just need to have 1 printer 29
that connected to the computer network, and all of that computers, can print using this 1 printer. 30
So this is one of the function of computer network. Absolutely, this is help us much right? 31
Another example of the function of computer network is to share data between computers. 32
In the past, or actually now we still use this method. You know about flashdisk right? We can 33
use flashdisk to share data from one computer to another computer. 34
For example we want to share data from the computer to the laptop. 35
Before computer network exists, we need to connecting a flashdisk to the computer, 36
then copy the data from the computer to the flashdisk. When this is done, 37
we need to bring the flashdisk to the laptop. And then now we can copy the data from the 38
flashdisk to the laptop. Now we have successfully share the data from the computer to the laptop. 39
But we have a problem here. Which is we need to bring the flashdisk from the computer to the laptop. 40
Let’s imagine that the computer is in the 1st floor in the building, 41
and the laptop is in the 10th floor. So we need to walk to bring this flashdisk 42
from the computer to the laptop. This is absolutely not efficient! 43
But now, if we use computer network, we don’t need to do that. We can share data between computer 44
and laptop using computer network, as long as computer and laptop is connected to the same 45
computer network. In this example, computer and laptop is connected to the same router, 46
so absolutely, we can share data between this computer and laptop. 47
So this is some of example how computer network can help us. First we can use computer network 48
for sharing a printer, and also we can use computer network to sharing data. 49
Besides these two example, we usually use computer network to access the internet. 50
For example, we can access facebook.com from the smartphone here. When we access facebook.com 51
from the smartphone like this, we already use a computer network. Why? Because our smartphone is 52
connected to the router using wifi, and the router is connected to ISP or 53
Internet Service Provider, and then the ISP is connected to the internet. 54
And absolutely, we have a facebook.com that also connected to the internet. 55
When we access facebook.com from the smartphone, the packet will be forwarded to the router, 56
from the router will be forwarded to the ISP, from the ISP will be forwarded to the internet, 57
and somehow the packet will be forwarded to the facebook.com. 58
So this is how we use computer network to access facebook.com from our smartphone. 59
Not only facebook.com, when we access internet like youtube, 60
twitter, or when you watch this video, you are using computer network! 61
Okay I hope you now understand what is computer network and how computer network can help us. 62
In the next video, we are going to learn about the most simple computer network. 63
Thankyou for watching and see you on the next video!