IPv4 Routing
In the first section of this chapter (“Overview of Network Layer Functions”), you read about the basics of IPv4 routing using a network with three routers and two PCs. Armed with more knowledge of IP addressing, you now can take a closer look at the process of routing IP. This section begins with the simple two-part routing logic on the originating host, and then moves on to discuss how routers choose where to route or forward packets to the final destination.
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