LAN- A local area network (LAN) is a privately owned and links the devices in a single
office, building or campus.
It allows resources to be shared between personal computers and work stations.
MAN- A metropolitan-area network (MAN) spreads over an entire city.
It may be wholly owned and operated by a private company, eg local telephone company.
WAN – A wide area network (WAN) provides long distance transmission of data, voice, image and video information over large geographic areas that comprise a country, a continent or even whole world.