200-301 · Question #548
Refer to the exhibit. Which action must be taken to ensure that router A is elected as the DR for OSPF area 0?
The correct answer is C. Configure the router A interfaces with the highest OSPF priority value within the area.. To ensure Router A is elected as the OSPF DR, its OSPF interface priority must be set to the highest value among all routers in the area.
Question
Refer to the exhibit. Which action must be taken to ensure that router A is elected as the DR for OSPF area 0?
Exhibits
Options
- AConfigure the OSPF priority on router A with the lowest value between the three routers.
- BConfigure router B and router C as OSPF neighbors of router A.
- CConfigure the router A interfaces with the highest OSPF priority value within the area.
- DConfigure router A with a fixed OSPF router ID
How the community answered
(20 responses)- A15% (3)
- B10% (2)
- C70% (14)
- D5% (1)
Why each option
To ensure Router A is elected as the OSPF DR, its OSPF interface priority must be set to the highest value among all routers in the area.
Configuring the OSPF priority with the lowest value (but not 0) would make Router A least likely to be elected as DR; a priority of 0 prevents DR/BDR election.
The OSPF Designated Router (DR) election process prioritizes the router with the highest OSPF interface priority (a value between 1 and 255). By configuring Router A's interfaces with a priority value greater than any other router in OSPF area 0, Router A will be elected as the DR for that multi-access segment after a new election cycle.
Concept tested: OSPF DR/BDR election priority
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13689-18.html
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