Computer network is a set of devices connected
together by media links for exchange of information
and other applications. These devices can be a
computer, printer or any other device which is
capable of sending and receiving information. The
links connecting these devices are called
communication channels. Any computer network should
meet at least following three criteria.
Broadly we can classify computer into three types.
(i) LAN (Local area
Restricted to a building or an organization.
(ii) MAN (Metropolitan
Coverage area is restricted to a metro city.
(iii) WAN (Wide area
covers the whole world.