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Exam 350-401 topic 1 question 493 discussion

Actual exam question from Cisco's 350-401

Question #: 493
Topic #: 1

[All 350-401 Questions]

When using BFD in a network design, which consideration must be made?

A. BFD is used with dynamic routing protocols to provide subsecond convergence.
B. BFD is used with first hop routing protocols to provide subsecond convergence.
C. BFD is used with NSF and graceful to provide subsecond convergence.
D. BFD is more CPU-intensive than using reduced hold timers with routing protocols.

Show Suggested Answer

Suggested Answer: A 🗳️

by Deu_Inder at Sept. 8, 2022, 3:30 p.m.

Comments

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Rose66

Highly Voted 2 years, 4 months ago

Selected Answer: A

D is wrong.... from https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1043332 "Because some parts of BFD can be distributed to the data plane, it can be less CPU-intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist wholly at the control plane."

upvoted 7 times

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ebulating

Most Recent 9 months, 3 weeks ago

BFD is often done directly at the NIC level and reduces CPU usage compared to things like SLA monitoring.

upvoted 2 times

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[Removed]

12 months ago

Selected Answer: A

We use BFD with BGP to provide fast routing reconvergence.

upvoted 1 times

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rami_mma

2 years, 2 months ago

Selected Answer: D

D is the correct option, since you can achieve subsecond without BDF

upvoted 1 times

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Nickplayany

2 years, 3 months ago

Selected Answer: A

It´s A - that´s the reason ISPs using this protocol.

upvoted 3 times

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Asymptote

2 years, 4 months ago

Selected Answer: A

A is correct, D is wrong, because reduced CPU burden is the core reason why BDF is introduced.

upvoted 3 times

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nushadu

2 years, 5 months ago

Selected Answer: A

D is completely wrong ... BFD is running in hardware NOT in software\CPU... A. is my choise

upvoted 3 times

nushadu

2 years, 5 months ago

+ it depends on model\hardware https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/xe-3s/asr903/irb-xe-3s-asr903-book/irb-bi-fwd-det.html

upvoted 1 times

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bora4motion

2 years, 6 months ago

B - I use that with OSPF.

upvoted 1 times

bora4motion

2 years, 6 months ago

I meant to say A.

upvoted 1 times

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yousif387

2 years, 6 months ago

Selected Answer: D

BFD can be used with static routes also

upvoted 1 times

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network_gig

2 years, 7 months ago

Selected Answer: A

A is correct

upvoted 3 times

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dougj

2 years, 7 months ago

Selected Answer: A

Correct answer is A. See here for detail: https://www.cisco.com/en/US/docs/ios/12_4t/ip_route/configuration/guide/t_bfd.html

upvoted 3 times

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Wooker

2 years, 8 months ago

Selected Answer: A

The correct answer is A.

upvoted 3 times

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Joseph123

2 years, 8 months ago

Selected Answer: A

Correct answer is A

upvoted 4 times

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kebkim

2 years, 8 months ago

A? Because some parts of BFD can be distributed to the data plane, it can be less CPU-intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist wholly at the control plane.

upvoted 2 times

siteoforigin

2 years, 8 months ago

Agreed, I think it is A as well. This doc also says it is less CPU intensive that low protocol timers: https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html#wp1043332

upvoted 3 times

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Caledonia

2 years, 8 months ago

Selected Answer: A

The answer is A. We use BFD with BGP to provide fast routing reconvergence. A. BFD is used with dynamic routing protocols to provide subsecond convergence.

upvoted 4 times

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Deu_Inder

2 years, 8 months ago

Selected Answer: D

Provided answer is correct.

upvoted 1 times

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