Introduction Computer Network !!

Introduction:

It is a group of interconnected computers all devices to have communication within themselves. Computer network consist of a collection of computers,printers and other equipment that is connected together so that they can communicate with each other.

Types Of Networks :

There are three types of network base on the geographical area they cover: LAN, MAN AND WAN .

The entire use of implementation of these types depend upon the geographical, i.e. LAN covers the smallest area; MAN covers the area larger than LAN and WAN comprises the largest of all.

Local Area Network (LAN) :

LAN covers smaller geographical area ( size is limited to a few kilometers) and are privately owned.
Usage area is limited to areas such as office building, home, hospital, schools, etc.
It was a short distance, and so the error and noise is minimized.
LAN is easy to setup.
Data transmits at very fast rate as the number of computer links are limited.
It is less expensive hardware and maintenance cost is also low.

Metropolitan area network (MAN):

MAN is larger area then of a LAN and smaller area as compared to WAN.
It connect two or more separate computer that reside in the same or different cities.
It coveres allah geographical area and may serve as an ISP ( Internet Service Provider).
It is hard to design and maintain Metropolitan Area Network.
Example of a MAN are the part of telephone company network that can provide a high speed DSL line to the customer or the cable TV network in a city.

Wide Area Network (WAN):

Wide Area Network is a computer network that extends over a large geographical area.
It might be confined within the bonds of a state or a country.
A WAN could be a connection of LAN connecting to other LAN'S we are a telephone lines and radio waves.
The technology is high speed and relatively expensive.
A communication medium used for WAN is Telephone Network or Satellite link.
Due to long distance transmission, the noise and error tends to be more in WAN.