A network engineer outputs the following information when troubleshooting OSPF protocol faults. <pre><code><Huawei>display ospf error interface GigabitEthernet 0/0/0 OSPF Process 1 with Router ID…

Question

Options

• AArea code mismatch
• BAuthentication type is inconsistent
• CThe IP address codes of the interfaces are inconsistent
• DRouter ID mismatch

• A
  78% (31)
• B
  8% (3)
• C
  13% (5)
• D
  3% (1)

Explanation

Option A is correct because the output explicitly shows 4 : Bad area id - four OSPF packets were discarded due to an area ID mismatch, while every other error counter reads zero, making this the sole cause of the failed adjacency. Option B is wrong because Bad authentication type shows 0 errors, meaning both sides agree on the authentication method. Option C is wrong because Bad net segment shows 0, ruling out an IP subnet mismatch between interfaces. Option D is wrong because Router id confusion also shows 0, so both routers have distinct, non-conflicting Router IDs.

Memory tip: In display ospf error output, the answer is always the one counter that is not zero - treat every other option as eliminated the moment you see its counter is 0.

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