classification of network
Definition of LAN
Is a network that connect computers and devices in a limited geophical area

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


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



classification 
definition
advantages&disadvantages
type
example