200-301 Question 333
Single answerTwo routers, R1 and R2, are configured with OSPF on the same subnet. However, they are not forming a neighbor adjacency. Upon investigating, you find that R1 is configured with a priority of 0, while R2 has a priority of 1. What could be the reason for the failure to form a neighbor adjacency?
- A
The priority value of 0 prevents R1 from participating in the DR/BDR election, but it can still form an adjacency.
- B
OSPF neighbor adjacency cannot form unless both routers have the same priority value.
- C
R1's priority of 0 prevents it from forming any OSPF neighbor relationship.
- D
The subnet mask mismatch between R1 and R2 is causing the adjacency failure.
Show answer and explanation
Correct answer: A
Explanation
In OSPF, a router with a priority of 0 is excluded from the DR/BDR election process but can still form neighbor adjacencies. The issue in this scenario is not related to the priority value but likely due to a different configuration mismatch not mentioned here. The priority of 0 does not prevent adjacency formation, making the first option the correct answer.
- A. Correct.
Correct: A priority of 0 means the router cannot participate in the DR/BDR election, but it can still form a neighbor adjacency.
- B. Incorrect.
Incorrect: OSPF does not require the same priority value for neighbor adjacencies to form.
- C. Incorrect.
Incorrect: A priority of 0 only affects DR/BDR election participation, not the ability to form neighbor adjacencies.
- D. Incorrect.
Incorrect: A subnet mask mismatch can prevent adjacencies, but in this case, no such issue was mentioned in the scenario.