Designated Intermediate System JN0-352 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A network administrator is examining the IS-IS link-state database on a router connected to a broadcast segment. The administrator sees an LSP that represents the broadcast network itself, with a system ID that is not any of the physical routers. What is this LSP and why does it exist?

   • AIt is a pseudonode LSP originated by the DIS to represent the broadcast network as a virtual node, reducing the number of adjacencies that must be advertised.
   • BIt is a CSNP that the DIS sends to advertise the contents of its link-state database to other routers.
   • CIt is a normal LSP originated by a non-DIS router to advertise its own interfaces and neighbors on the broadcast segment.
   • DIt is a Level 2 LSP originated by the DIS to advertise routes to other areas, which is why it has a different system ID.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   What is a primary responsibility of the Designated Intermediate System (DIS) on a broadcast network?

   • AMaintaining the routing table for all routers
   • BFlooding all LSPs to every neighbor individually
   • COriginating a pseudonode LSP and sending periodic CSNPs
   • DActing as the only router that can forward traffic
   Reveal Solution Discussion Select an answer first
4. 3expert · hard

   A network engineer is troubleshooting a database synchronization issue on a broadcast IS-IS segment. The engineer notices that a non-DIS router, R9, is not receiving all LSPs from the DIS. What is a possible cause and how can it be verified?

   • AR9 is not sending PSNPs to request missing LSPs, which can be verified by checking the IS-IS adjacency state.
   • BThe DIS is sending CSNPs, but R9 is ignoring them due to a mismatched area address, which can be verified by checking the IS-IS area configuration.
   • CR9 has a higher priority than the DIS and is trying to take over, which can be verified by checking the DIS election results.
   • DThe DIS is not sending CSNPs, which can be verified by checking the DIS's interface statistics for CSNP packets sent.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   On a broadcast segment that is part of both Level 1 and Level 2, how many DISs are elected?

   • AOne DIS for both levels
   • BTwo DISs, one for Level 1 and one for Level 2
   • CNo DIS is elected if the segment is in both levels
   • DOne DIS per router on the segment
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   How does the DIS help maintain link-state database synchronization on a broadcast segment?

   • ABy sending CSNPs periodically to describe its database
   • BBy flooding LSPs only to the DIS
   • CBy requiring all routers to send their full database to it
   • DBy acting as a route reflector for all LSPs
   Reveal Solution Discussion Select an answer first