Looking Ahead

IP addresses and addressing issues are basic elements of interdomain routing. IP addressing defines where certain information can be found, but it does not give any indication of the pathway by which the information is to be accessed. Hosts need a mechanism to exchange information about destinations and to calculate the optimal path to reach a given destination. This mechanism, of course, is routing.

This chapter concludes all the fundamental material required before proceeding to further study of Internet routing architectures. The next chapter covers the basics of interdomain routing, building on the concepts of addressing, global networks, and domains that have already been discussed. Routing protocols in general, and BGP in particular, will be discussed, with implementation details on BGP to follow in Chapter 5 and beyond.

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