Routing Protocols
For routing logic to work on both hosts and routers, each needs to know something about the TCP/IP internetwork. Hosts need to know the IP address of their default router so that hosts can send packets to remote destinations. Routers, however, need to know routes so that routers know how to forward packets to each and every IP network and IP subnet.
Although a network engineer could configure (type) all the required routes, on every router, most network engineers instead simply enable a routing protocol on all routers. If you enable the same routing protocol on all the routers in a TCP/IP internetwork, with the correct settings, the routers will send routing protocol messages to each other. As a result, all the routers will ...
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