LAN: A local area network (LAN) is a network that connect computers and devices in a limited georaphical area (within the same building) suc as school computer lab and office building
.

MAN: A metropolitan area network(MAN) is a high-speed network that connects local area network (LANs) in a metropolitan area such as campuses,offices,and goverment,that are frequently used as links between buildings


WAN: A wide area network(WAN) is a network that covers a large geographical area located within a country side and worldwide networks such as a city ,country,or the world