Figure 316 Using a router as an Ip Wan gateway

As indicated in Figure 3-16, the LAN's IP network domain extends up to, and includes, the router interface port. The domain does not include the entire router or all its ports. Each port can be programmed to function as the interface for a different IP network domain. This is one of the attributes that make a router so uniquely capable of internetworking. It can function as a point of inter- section for two or more different networks. More importantly, it can support the physical intersection of networks (either LANs or connections to other routers) with a series of services that facilitate forwarding of data between different networks.

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