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An internetwork requires many protocols and features to permit scalability and manageability without constant manual intervention. Large internetworks can consist of the following three distinct components: •Campus networks, which consist of locally connected users in a building or group of buildings •Wide-area networks (WANs), which connect campuses together •Remote connections, which link branch offices and single users (mobile users and/or telecommuters) to a local campus or the Internet. This design guide applies to each aspect of networking.
Internetworking—the communication between two or more networks—encompasses every aspect of connecting computers together. Internetworks have grown to support vastly disparate end-system communication requirements