Exam 350-401 topic 1 question 633 discussion

Actual exam question from Cisco's 350-401

Question #: 633
Topic #: 1

Which of the following statements regarding the use of Bidirectional Forwarding Detection (BFD) in a Cisco SD-WAN environment are true?

A. BFD cannot be disabled on SD-WAN routers.
B. OSPFv3 is not supported with BFD.
C. In addition to link failure detection, it is also used to measure loss and latency used by application aware routing.
D. Is not typically enabled for OMP.
E. Does not support BGP.

Show Suggested Answer

Suggested Answer: AC 🗳️

by iGlitch at Nov. 24, 2022, 9:19 p.m.

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Tacolicious

Highly Voted 2 years, 8 months ago

Selected Answer: AC

Answer provided is correct: Runs on SD-WAN tunnel to detect failures in the overlay tunnel Is enabled by default and cannot be disabled Is typically enabled for OMP Besides link failures, it also measures latency, loss, and other link statistics used by application-aware routing https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-bfd-for-routing-protocols.html#Cisco_Concept.dita_26cf6354-cce5-4799-b140-f518adc78a40

upvoted 10 times

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studyguy42

Most Recent 3 weeks, 6 days ago

Selected Answer: AC

When I ask ChatGPT and Grok (caveat I add the addendum "choose all that apply") it says A, C, and D are all true. Since the question does not prompt for how many might be true, I'll probably select all three if prompted in a real test A. BFD cannot be disabled on SD-WAN routers. C. In addition to link failure detection, it is also used to measure loss and latency used by application aware routing. D. Is not typically enabled for OMP.

upvoted 1 times

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RGRVG

2 months, 2 weeks ago

Selected Answer: C

C. is not asking for more than one option

upvoted 1 times

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chmacnp

6 months, 1 week ago

Selected Answer: AC

surprising that Cisco enforces the use of BFD on it's SDWAN solution. but A & C are the answers

upvoted 1 times

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Gonzo9000

11 months, 3 weeks ago

Selected Answer: C

The question doesn't say to select more than one answer? I chose C.

upvoted 2 times

hodi

11 months ago

totally agree

upvoted 2 times

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slacker_at_work

1 year, 5 months ago

Selected Answer: AC

The BFD (Bidirectional Forwarding Detection) is a protocol that detects link failures as part of the Cisco SD-WAN (Viptela) high availability solution, is enabled by default on all vEdge routers, and you cannot disable it. BFD and related parameters: Path liveliness and quality measurement detection protocol: Up/Down, loss/latency/jitter, IPSec tunnel MTU, Runs between all routers in the topology Uses hello (up/down) interval, poll interval and multiplier for detection

upvoted 1 times

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