Basics about Networking (CCNA) from Scratch? Part 1

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Networking is interconnecting two or more computers to access resources present on the network; with networking we can share data, pictures, resources etc. between multiple users present on the network. We can share files with other person present on other location and we can communicate with that in the same context.
As shown below there are two computers connected with each other through wire and it can be connected through wire as well as we can connect them via wireless. If you want to connect with wireless then u must be having a wireless network card installed in your computer.

Whereas for Wired network Local Area Network Card is required this is installed in your Pc. As you see in the above picture there is a networking device placed between computers which we call as switch and other side wireless switch is sending the radio signals these are the basic two types of network with which you can do networking.
How is it done?

                                                       


In the above example A and B are two computers which are connected with wire, to connect these computers with wire we need a device called NIC Card (Network Interface Card). NIC card is mandatory in both the computers to communicate.  In the above diagram we have two NIC cards one in compute A and one in computer B, wire is connected with these NIC cards.

Particular Jack to which Network Interface Card ( NIC ) connects to through wire :-
RJ 45 (Registered jack 45).

We use different types of cabling technology let me just name some of them :-
CAT 5 cable
Optical Fiber.

To communicate it should have a name both the computers must have a name to communicate. As we have Computer A and Computer B which has been identified with NIC .How is the name has been defined? Which is unique identity for computer A and computer B which is been identified through your NIC card. NIC will have MAC Address; NIC will have a naming section which is a unique Identity in the world, now we have named it also. To communicate rules has to be setup; these rules are called as Protocols.

Protocols:-

Set of rules layered on network.

MAC Address:-

Media Access Controller

Connecting computers:-

LAN (Local Area Network)

Small network inside a campus like you are connecting floors first floor to second floor, ex 15 computers connected in a university.

MAN (Metropolitan Area Network)

Connect across cities, ex computers connected from different branches of university.

WAN (Wide Area Network)

Connecting whole world, ex internet.

Next page Part 2

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