Unlike a WAN, however, a campus network does not use public or private telephone lines, all buildings are typically direct connected with cable or wireless systems. CANs range in speeds from 56kbps to 155Mbps. Most use dedicated switches and phone lines leased from a telecommunications company and operate through a T3 at almost 45 Mbps. MANs are usually designed to group several LANs together. They are larger than LANs but can be faster or slower.
MANs are smaller than WANs but are faster.
WAN - Wide Area Network Consists of machines that may be spread out over larger areas, such as across a college campus, an industrial park, a city, a state, or a country. WANs usually include some type of remote bridges or routers, which are used to connect groups of nodes via public or privately leased telephone lines. Because of this, the bandwidth for WANs tends to be considerably smaller than for LANs. Usually an internet-work that extends across national boundaries and that may connect nodes on opposite sides of the world. As with very widely distributed WANs, most GANs are likely to be internet-works in disguise.