A WAN (wide area network) spans large physical distance. The Internet is the small largest WAN, spanning the Earth. A WAN is a geographically – dispersed collection of LANs. A network device called a router connects
LANs to a WAN. In IP networking, the router maintains booth a LAN address a WAN address. WANs tend to use technology like ATM, Frame Relay and X.25 for connectivity over the longer distances.
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