Exam 350-401 topic 1 question 506 discussion

Actual exam question from Cisco's 350-401

Question #: 506
Topic #: 1

[All 350-401 Questions]

Refer to the exhibit. The OSPF neighborship fails between two routers. What is the cause of this issue?

A. The OSPF process is stopped on the neighbor router.
B. The OSPF router ID is missing on this router.
C. The OSPF router ID is missing on the neighbor router.
D. There is an MTU mismatch between the two routers.

Show Suggested Answer

Suggested Answer: D 🗳️

by kebkim at Oct. 4, 2022, 10:12 p.m.

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kebkim

Highly Voted 2 years, 2 months ago

Neighbor Stuck in Exstart Exchange State : OSPF neighbors that are in the exstart or exchange state are trying to exchange DD packets. The adjacency should continue past this state. If it does not, there is a problem with the DD exchange, such as a maximum transmission unit (MTU) mismatch or the receipt of an unexpected DD sequence number.

upvoted 6 times

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nushadu

Highly Voted 1 year, 12 months ago

Selected Answer: D

cisco_R2(config-subif)#do debug ip osp adj OSPF adjacency debugging is on cisco_R2(config-subif)#ip mtu 1111 <<<<<<<<<<<<<<<< cisco_R2(config-subif)# cisco_R2(config-subif)# cisco_R2(config-subif)#do clear ip ospf !!!debug shows this: cisco_R2(config-subif)# *Dec 23 13:02:27.164: OSPF-1 ADJ Et0/0.10: Rcv DBD from 6.6.6.6 seq 0x19FD opt 0x52 flag 0x7 len 32 mtu 1500 state EXSTART <<<<<<<<<<<<< *Dec 23 13:02:27.164: OSPF-1 ADJ Et0/0.10: Nbr 6.6.6.6 has larger interface MTU <<<<<<<<< *Dec 23 13:02:27.164: OSPF-1 ADJ Et0/0.10: Rcv DBD from 6.6.6.6 seq 0x26B opt 0x52 flag 0x2 len 112 mtu 1500 state EXSTART *Dec 23 13:02:27.164: OSPF-1 ADJ Et0/0.10: Nbr 6.6.6.6 has larger interface MTU *Dec 23 13:02:27.395: OSPF-1 ADJ Et0/0.10: Rcv DBD from 6.6.6.6 seq 0x26B opt 0x52 flag 0x2 len 112 mtu 1500 state EXSTART

upvoted 6 times

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