A local area network (LAN) is a network that connects computers and devices in a limited geographical area such as a home, school computer lab
and office building
DEFINITION OF 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
DEFINITION OF LAN
A wide area network (LAN) is a network thats covers a large geographical area located within a countryside and worldwide networks such as city
,country or the world .