Review Questions

1:	Name the three network layer protocols that form the basis of ISO connectionless network services.
2:	How many levels are there in the routing hierarchy supported by the IS-IS routing protocol?
3:	What is the general layout of the IS-IS packet format?
4:	What does the acronym NSAP stand for, and what is it used for?
5:	What are the three major components of an NSAP? Describe the significance of each.
6:	What is the maximum length of an NSAP, and what is the minimum length that can be configured on a Cisco router?
7:	What is the significance of the IS-IS link-state database?
8:	What is the basic difference between Level 1 and Level 2 link-state databases?
9:	How are flooding and database synchronization different between a point-to-point link and a broadcast link?
10:	Describe the two steps for enabling basic IS-IS routing on a Cisco router.
11:	List some show commands that you can use to verify configuration and operation of IS-IS.