CHAPTER 8

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A Router’s Got to Learn Its Routing Table …

It is a well-documented fact that guys will not ask for directions. This is a biological thing. This is why it takes several million sperm cells … to locate a female egg, despite the fact that the egg is, relative to them, the size of Wisconsin.

—Dave Barry, humorist

Every router needs to eventually build its own information table, which contains the addresses of all the reachable networks in the domain, as well as the address of the next hop router or network directly connected to the router for each of those destination networks. This chapter discusses how routers and their protocols determine ...

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