Understanding the Routing Process

Routers and multilayer switches tie subnets together and use IP addresses to locate destinations on behalf of hosts that are in directly connected networks and on behalf of hosts that may be located many routers, or hops, away. That's because no single router performs the routing process for a host unless the source and destination networks are directly connected, as shown in Figure 11.1.

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FIGURE 11.1 Local routing

In Figure 11.1, the router R1 can perform the entire routing job because the source and destination computers are connected to switches that are directly connected to R1. This is possible because routes ...

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