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IP Routing Primer by Robert Wright

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Understanding What a Router Does

The previous sections introduced some basic concepts about routers and discussed where they might be deployed. This section presents some advanced concepts in IP routing behavior, providing examples based on the network topology presented in the first sections.

You now know that a router has a routing table containing network prefixes for IP network addresses it knows about. This section explains how a router uses its routing table to determine which interface it should forward an IP datagram over in order to send it to its destination.

IP datagrams flow through a network one router at a time. Each router in a path must make its own decision about the best interface to forward a packet over to get it to its destination. ...

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