A corporate area network (CAN) is a separate, protected portion of a corporation's intranet. When people are on the corporate area network, they are sometimes said to be in the CAN: they do not have access to the Internet -- or to the rest of the corporate network, for that matter. Users may be connected directly, for example in a token ring configuration, or may be geographically dispersed and connected by backbone lines.
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CAN is sometimes said to stand for campus area network, where it refers to an interconnection of local area networks (LANs) that are geographically dispersed more widely than in a LAN, but less so than in a wide area network (WAN).