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Routing
An internetwork consists of two or more physically connected independent networks that are able to communicate. The networks that make up an internetwork can be of very different types. For example, an internetwork can include Ethernet and Token Ring networks.

Because each network in an internetwork is assigned an address, each network can be considered logically separate; that is, each network functions independently of other networks on the internetwork. Internetwork connectivity devices, such as routers, can use network address information to assist in the efficient delivery of messages. Using network address information to deliver messages is called routing. The common feature that unites internetwork connectivity devices (routers and brouters) is that these devices can perform routing. The following list details some common internetwork connectivity devices:
Each of these devices is discussed in the following sections.

Further Information