A WAN covers a large geographic area with various communication facilities such as long distance telephone service, satellite transmission, and under-sea cables. The WAN typically involves best computers and many different types of communication hardware and software. Examples of WANs are interstate banking networks and airline reservation systems. Wide area networks typically operate at lower link speeds ( about 1 Mbps) Following are the salient features of WAN:
• Multiple user computers connected together.
• Machines are spread over a wide geographic region
• Communications channels between the machines are usually furnished by a third party (for example, the Telephone Company, a public data network, a satellite carrier)
• Channels are of relatively low capacity (measuring through put in kilobits per second, k bits) .
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