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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Configuring IP Routing in Our Network

Our network is good to go—right? After all, it’s been correctly configured with IP addressing, administrative functions, and even clocking (automatically on the ISR routers). But how does a router send packets to remote networks when the only way it can send them is by looking at the routing table to find out how to get to the remote networks? Our configured routers only have information about directly connected networks in each routing table. And what happens when a router receives a packet for a network that isn’t listed in the routing table? It doesn’t send a broadcast looking for the remote network—the router just discards it. Period.

So we’re not exactly ready to rock after all. But no worries—there ...

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