Not only the reputation of the computer network, but if it was not invented, you could not read this article (using the internet) and I could not write.

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What is a computer network?

Simply put, computer network or networking exists, where multiple computers are connected to each other and share data and hardware resources. Your single computer machine is capable of doing much more than your machine by adding a lot of powerful devices but with more computer or instrumentation (EG modem, printer, scanner, router etc.). Computers in computer networks are connected through its fiber optic cable, or wireless technology so that different different devices (nodes) can talk to each other. According to the needs of the people, we use computer networks for different purposes.

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Kinds of Networking:

Computer networking or networking is not easy, but network is not one type; For example, I'm currently using laptops and my laptop is connected to home router. Besides, my laptop has more small devices, including printers, external hard drives, and you can compare my current situation to PAN or Personal Area Network - you can also call it a single person network. But if I give an example of an office where some computers are connected together, multiple printer scanners are connected together and the Internet connection is shared with everyone; Then it will be called LAN or Local Area Network. But the LAN can be more massive, not just an office or school computer or hardware, it may be that the computers of any area or all countries of the world or the world can be connected together. And so huge networking is called WAN or Wide Area Network. The Internet is Wan, which is connected to all the world's computers.

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Protocol

The computer always follows the logic, and wherever there are logic, there are specific rules. Comparison with an army in the computer network. Just as all the members of the army follow the rules of that group, all the computers in the network work according to the network's instructions. For example, let's talk about the LAN, each connected nan in the LAN (computer or other device such as printer, scanner) must be connected to a common pattern called network topology. If you want to line them long enough to connect computers, you can work from one computer to another computer, from one computer to another. The machine can also be connected to the star seeping machine or the machine can be connected by creating a connection loop in the ring. Following the next picture you get a more clear idea. In addition, computers in the network, following the same rule, talk to each other, it is called protocol.

Permission and security

Permission and security at networking is a vital thing. No computer will obey any of your orders because it is connected to your network. If you want to get any information from your other computer or use a resource, you must have the permission. For example, say internet, where the thousand corer website is on the server and you can access the pages you want. But this does not mean that you can access every single file from the web server. I will not be able to access my personal files as well as you can not access them. But if you have permission, you can access it.

How is the network formed?

Every node in the network has a special circuit, which is called network card or network interface card or NIC. Today's new computers or laptops have network cards built-in. But if your computer is old, you need to separate a network card so that it can be connected to other computers in the network. Each network card has a unique code number, so that the card can be identified separately and this number is called a Mac address (MAC) or Media Access Control.

You know how networking keys and computer networks are connected to computers with each other.

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