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4A0-101 Exam - Question 22


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Two neighboring OSPF routers have exchanged the packets shown. What state is the adjacency in?

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Correct Answer: B

The two routers have an Area ID mismatch, as one router has an Area ID of 0.0.0.0 and the other has an Area ID of 0.0.0.1. For OSPF adjacency to form, the Area IDs must match. Therefore, the adjacency is down.

Discussion

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sikapi2124Option: B
Nov 1, 2020

Area ID in Hello packets are different so Adj. should be down

Kri8orOption: B
Mar 21, 2019

IMO, It should either be in Init or Down. If it was Exstart, we automatically assume that DR and BDR have been selected. Clearly this is not the case – they still haven’t decided who’s DR and who’s BDR. The only possible option is down, i think

ocenicOption: B
Nov 1, 2020

Here is debug output 40 2020/11/01 01:17:34.79 UTC MINOR: DEBUG #2001 Base OSPFv2 "OSPFv2: PKT DROPPED area mismatch" and there is no neighborship No. of Neighbors: 0