Chapter 8

1:	What is the main purpose and use of configuring up to three different area addresses on a single router?
A:	You configure multiple area addresses within a transition period when migrating from one area address to another.
2:	What is the consequence of configuring more than one area address on a single router?
A:	The Link-State databases of the two areas are merged, consequently merging the areas into one.
3:	What is the purpose of the transition keyword when used with the metric-style command?
A:	It enables the router to advertise and accept both old- and new-style TLVs.
4:	How many types of hello packets are used on point-to-point interfaces on Cisco routers?
A:	Only a single hello packet
5:	What is the purpose of the mesh- group blocked command?
A:	It blocks LSP flooding on the applicable interface.
6:	What is the default behavior of a member within a mesh group?
A:	Within the mesh group, an LSP received from a member is not forwarded to other members of the same group but forwarded to nonmembers.
7:	What is the purpose of the distance command?
A:	The distance command places an administrative weight, referred to as administrative distance, on routes from a particular routing protocol. The administrative distance is used to discriminate between multiple instances of the same route received from multiple routing protocol sources. The route with the lowest administrative distance is preferred for insertion into the routing table.
8:	What precautions must be taken when configuring mutual redistribution between Integrated IS-IS and other coexisting IGPs?
A:	Configure route filters to stop redistribution feedback and eliminate any possibility of routing loops .
9:	What caveat must always be adhered to when running IS-IS for CLNS and IS-IS for IP in the same area?
A:	All routers within the area must be configured in a consistent manner so that they are IP-only, CLNS-only, or operating in dual mode ”both IP and CLNS. They are applied on a per-router basis and not per-interface basis.