In the context of data communications, a network is a communication of devices or nodes connected to each other through one of the communication channels just discussed. Networks in which a single host computer serves only dumb terminals are becoming obsolete as prices of microcomputers have plummeted.There are two basic types of networks: LANs (local area networks), which serve an office or several adjacent offices; and WANs (wide area networks), which are larger, national or global networks use the same type of layout, also called topology, and the same types of protocols for signal transmission and reception. In such cases, the only difference between LANs and WANs is the distance between the networked computers.
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