a)LAN(Local Area Network):-
A LAN is usually privately owned and links the devices in a single office, building or campus. LANs are designed to allow resources to be shared between personal computers are workstations.
b)MAN(Metropolitan Area Network):-
A MAN is designed to extend over an entire city. It may be a
single n/w such as a cable tv n/w, or it may be means of connecting a number of LANs into a larger network so that resources may be shared LAN-to-LAN as well device-to-device.
c)WAN(Wide Area Network):-
WAN provides long distance transmission of data, voice, image and video information over large geographical areas that may comprise a country, or even the whole world.