Designated Intermediate System (DIS) JN0-364 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A service provider is deploying a new broadcast segment with four routers. The network engineer sets the IS-IS interface priority to 100 on Router A, 80 on Router B, 64 on Router C, and 64 on Router D. Router B has the highest MAC address among all four routers. After the initial election, the engineer changes Router A's priority to 50. Which router will be the DIS after the priority change, and why?

   • ARouter A remains the DIS because IS-IS does not preempt the current DIS when priority changes.
   • BRouter B becomes the DIS because it now has the highest priority among the remaining routers.
   • CRouter D becomes the DIS because it has the same priority as Router C but a higher MAC address.
   • DRouter C becomes the DIS because it has the lowest priority and IS-IS elects the lowest priority as DIS.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   An IS-IS router on a broadcast segment has its interface priority increased to the highest value. What happens to the current DIS?

   • AIt remains the DIS until it fails
   • BIt triggers a new election immediately
   • CIt becomes the backup DIS
   • DIt is immediately replaced by the higher-priority router
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   On an OSPF broadcast network, the Backup Designated Router (BDR) serves which purpose that has no equivalent in IS-IS?

   • AIt maintains adjacencies with non-DR routers
   • BIt takes over as DR if the current DR fails
   • CIt floods LSAs to all routers on the segment
   • DIt reduces the number of adjacencies on the segment
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which responsibility is unique to the Designated Intermediate System (DIS) on an IS-IS broadcast network?

   • AAssigning area addresses to neighbors
   • BForwarding data packets between routers
   • CCalculating the shortest path tree
   • DFlooding CSNPs on the LAN
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   In IS-IS, what does the pseudonode represent in Link State PDUs (LSPs) on a broadcast network?

   • AThe area's designated router for inter-area traffic
   • BA backup router for redundancy
   • CThe DIS router itself
   • DThe broadcast segment as a virtual node
   Reveal Solution Discussion Select an answer first