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Exam 300-410 topic 1 question 139 discussion

Actual exam question from Cisco's 300-410
Question #: 139
Topic #: 1
[All 300-410 Questions]

An engineer configured Reverse Path Forwarding on an interface and noticed that the routes are dropped when a route lookup fails on that interface for a prefix that is available in the routing table.
Which interface configuration resolves the issue?

  • A. ip verify unicast source reachable-via l2-src
  • B. ip verify unicast source reachable-via allow-default
  • C. ip verify unicast source reachable-via any
  • D. ip verify unicast source reachable-via rx
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by Hack4 at Feb. 25, 2022, 4:28 p.m.

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Highly Voted 2 years, 11 months ago
Ref: Security - Configuring Network Security [Support] - Cisco Systems “… Configuring the Unicast RPF Check Mode There are two Unicast RPF check modes: • Strict check mode, which verifies that the source IP address exists in the FIB table and verifies that the source IP address is reachable through the input port. • Exist-only check mode, which only verifies that the source IP address exists in the FIB table. … When configuring the Unicast RPF check mode, note the following information: • Use the rx keyword to enable strict check mode. • Use the any keyword to enable exist-only check mode. • Use the allow-default keyword to allow use of the default route for RPF verification. …” The route lookup failed, but the prefix is in the routing table. RPF Exist-only check mode is the way to go. A. ip verify unicast source reachable-via l2-src Wrong answer. B. ip verify unicast source reachable-via allow-default Wrong answer. C. ip verify unicast source reachable-via any Correct answer. D. ip verify unicast source reachable-via rx Wrong answer.
upvoted 10 times
dapardo
1 year, 2 months ago
Thanks @GreatDane for providing information about the questions, this makes easier the study
upvoted 1 times
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GReddy2323
2 years, 4 months ago
Thank you very much for your awesome answers.
upvoted 1 times
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Luvshah
1 year, 8 months ago
Hi, Could you please provide me your email address ? Thanks
upvoted 1 times
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inteldarvid
Most Recent 2 years ago
Selected Answer: C
correct is C : https://www.exam-answer.com/configure-reverse-path-forwarding
upvoted 1 times
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wts
3 years, 3 months ago
the packet is dropped even though there is a route for the source address in the routing table - seems so much clearer what's going on
upvoted 1 times
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Hack4
3 years, 4 months ago
THE given answer is correct
upvoted 1 times
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C (25%)
B (20%)
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