Review Questions

$$ Compare and contrast link$-$state and distance$-$vector routing algorithms.

Discuss how a hierarchical organization of the Internet has made it possible to scale to millions of users.

Is it necessary that every autonomous system use the same intra$-$AS routing algorithm? Why or why not?

Why are different inter$-$AS and intra$-$AS protocols used in the Internet?

Why are policy considerations as important for intra$-$AS protocols, such as OSPF and RIP, as they are for an inter$-$AS routing protocol like BGP$?$