Exam 300-410 topic 1 question 500 discussion

Actual exam question from Cisco's 300-410

Question #: 500
Topic #: 1

Refer to the exhibit. An engineer recently implemented uRPF by configuring the ip verify unicast source reachable-via rx command on interface gi0/3. The engineer noticed right after implementing uRPF that an inbound packet on the gi0/3 interface with a source address of 172.16.3.251 was dropped. Which action resolves the issue?

A. Configure uRPF loose mode to forward the packet.
B. Permit the 172.16.3.251 in the inbound ACL on interface gi0/3.
C. Remove inbound ACL from the interface gi0/3 to allow 172.16.3.251.
D. Configure uRPF strict mode to forward the packet.

Show Suggested Answer

Suggested Answer: A 🗳️

by Rman0059 at Nov. 10, 2023, 11:37 p.m.

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XxnightwingxX

1 month ago

Selected Answer: A

The wording of the question strongly implies that this traffic was flowing fine before the engineer implemented uRPF in strict mode, which also implies there is no ACL blocking the traffic so the answer is A.

upvoted 1 times

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wwwwaaaa

4 months, 2 weeks ago

Selected Answer: B

It is very tempting to go with A, however I dont see 172.16.3.251 as a prefix that CEF sees. I dont think we need to assume that this is a result of uRPF strict mode niether we are aware of an ACL blocking it, nor that option B is clear. I would go with B TBH

upvoted 2 times

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[Removed]

9 months, 1 week ago

Selected Answer: A

A is correct

upvoted 1 times

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Rman0059

1 year, 5 months ago

Selected Answer: A

A is correct. Need to enable loose mode

upvoted 4 times

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Exam 300-410 topic 1 question 500 discussion

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XxnightwingxX

wwwwaaaa

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Rman0059

SY0-701