Review Questions

1:	How many levels of hierarchy does the IS-IS routing protocol support and what is their significance?
2:	What is the reason for suboptimal interarea routing in the ISO 10589 architecture?
3:	Name the two categories of IS-IS protocol functions and describe the services they provide.
4:	What is the general layout of IS-IS packet formats?
5:	List the TLVs specified by ISO 10589.
6:	List the TLVs specified by RFC 1195 and describe their significance.
7:	How does the TLV Type 133 specified by RFC 1195 differ from the original authentication TLV Type 10 specified by IS0 10589?
8:	Describe any differences between the adjacency formation processes on point-to-point and broadcast links.
9:	Describe the three-way adjacency formation process that has been proposed in the IETF to enhance the method for forming adjacencies on point-to-point links.
10:	What is the relevance of the pseudonode functionality?
11:	Briefly describe the DIS election and replacement process.
12:	Explain why no backup DIS exists.

NOTE

RFC drafts are continuously being updated, so their number suffixes might change ”at one point, they might cease to exist as drafts as they become RFCs.