Designated Intermediate System Operation JN0-664 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the primary benefit of having a DIS as the central point for LSP flooding on a broadcast network?

   • AIt eliminates the need for LSP acknowledgments
   • BIt ensures that LSPs are only sent to routers that need them
   • CIt allows the DIS to filter LSPs based on policy
   • DIt reduces the number of LSPs that need to be transmitted
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A network engineer is configuring IS-IS on a broadcast segment with four routers. The routers have the following priorities: R1=100, R2=64, R3=100, R4=64. All routers have different MAC addresses. Which router will become the DIS?

   • AR1, because it has the highest priority and the highest MAC address among the highest-priority routers.
   • BR3, because it has the highest priority and the lowest MAC address.
   • CR2, because it has the lowest priority and is least likely to cause issues.
   • DR4, because it has a lower priority but a higher MAC address.
   Reveal Solution Discussion Select an answer first
4. 3expert · hard

   A service provider has a broadcast segment with three routers. The current DIS has a priority of 100. A new router is added with a priority of 200. The network administrator wants the new router to become the DIS as soon as possible. What is the best course of action?

   • AChange the current DIS's priority to 0.
   • BManually reset the IS-IS process on the current DIS.
   • CChange the new router's priority to 0 and then back to 200.
   • DWait for the current DIS to fail or be reset.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A network engineer is planning for DIS redundancy on a critical broadcast segment. What is the recommended approach to ensure minimal disruption if the DIS fails?

   • AEnsure the DIS has a lower hold time to speed up failure detection.
   • BAccept that there will be a brief disruption while a new DIS is elected after the hold time expires.
   • CSet all routers to the same priority so that the MAC address tie-breaker selects a predictable backup.
   • DConfigure a backup DIS with a high priority to take over immediately.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A service provider is designing a network with a broadcast segment that has many routers. They want to minimize the number of adjacencies and LSPs on the segment. How does IS-IS achieve this?

   • ABy using a full mesh of adjacencies between all routers.
   • BBy using a designated backup router to handle adjacencies.
   • CBy using the DIS to create a pseudonode and establish adjacencies only with the DIS.
   • DBy disabling IS-IS on the broadcast segment.
   Reveal Solution Discussion Select an answer first