Network Basic

What is networking:

A network is set of hardware devices connected together, either physically or logically to allow them to exchange information

Classification:

Networks are often divided by size and general communication method into three classes:

1. LAN (Local Area Network): Small networks in a house. WLAN (Wireless LAN) that connect devices without wires, using radio frequencies or light. It usually connects wireless devices to each other and also to the wired portion of the network.

2. MAN (Metropolitan Area Networks): The networks created in small region or a city. It also can be with wireless sometimes called WMAN.

3. WAN (Wide Area Network): In the world. Example Internet we found everywhere. That’s mean it’s a wide area network. Started at USA and end at our home. There is also the term WWLAN (Wireless WAN), which just refers to a WAN that uses wireless technology.

There are more few terms to classify networks.

* PAN (Personal Area Network): it generally means a very small LAN with a range of only a few feet, used by a single person or by a group. It also can be wireless PAN (WPAN). For an example: Bluetooth.

* CAN (Campus Area Networks): CAN is one created to span multiple buildings in the same location, such as the campus of a university

Now imagine that there is no network in this word. But me and one of my friend thinking to connect our PCs and want to share our resources. Can u tell me how can we connect our PCs? There is no option without wire. Yes Wire! We can connect our PCs with wire. Wire will be a Media, which will carry data from one computer to another. So we have to know little about media. 

Types of Media:

There are two types of media

1.      Guided

2.      Unguided

Guided Media: Wire

Unguided Media: Wireless (Infrared, Blue tooth)

Here we are thinking about Guided Media. So we should know the types of wire.

There are 3 types of cable we use as Guided Media.
* Coaxial Cable
* Twisted pair Cable
* Fiber Optics

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