Designated Router and Backup Designated Router JN0-364 Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   In an OSPF broadcast network, the DR and BDR both fail simultaneously. What is the impact on OSPF convergence, and how does the network recover?

   • AAll adjacencies are torn down, and a new DR/BDR election occurs; convergence is delayed until the election completes.
   • BThe DROTHERs form a full mesh of adjacencies to compensate.
   • CThe network partitions until one of the failed routers returns.
   • DThe router with the highest router ID automatically becomes the new DR without an election.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A network engineer is troubleshooting OSPF adjacencies on a broadcast segment. They notice that two DROTHER routers are stuck in 2-Way state. What is the likely reason?

   • AThe router priority is set to 0 on both routers.
   • BThe hello and dead intervals are mismatched.
   • CDROTHERs do not form full adjacencies with each other by design.
   • DThe router IDs are identical.
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What happens in OSPF when the designated router (DR) on a broadcast segment fails?

   • AThe network segment becomes non-functional until a new DR is elected.
   • BThe router with the highest router ID becomes the new DR.
   • CAll routers elect a new DR from scratch, and the BDR remains as BDR.
   • DThe BDR is promoted to DR, and a new BDR is elected.
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   Why is a DR/BDR election not performed on a point-to-point OSPF network?

   • ABecause point-to-point networks do not support multicast, which is required for DR/BDR election.
   • BBecause only two routers are on the link, so a full adjacency is formed directly without the need for a central point.
   • CBecause point-to-point links are always configured with a priority of 0.
   • DBecause the OSPF protocol does not support DR/BDR on point-to-point links by design.
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   What is the role of the backup designated router (BDR) in OSPF on a broadcast network?

   • ATo act as a backup for data forwarding if the DR fails
   • BTo take over as the DR if the current DR fails, and to maintain adjacencies with all routers
   • CTo forward LSAs on behalf of the DR to reduce the DR's load
   • DTo monitor the network and report failures to the DR
   Reveal Solution Discussion Select an answer first