Exam 350-501 topic 1 question 118 discussion

Actual exam question from Cisco's 350-501

Question #: 118
Topic #: 1

[All 350-501 Questions]

Refer to the exhibit Which effect of this configuration is true?

A. R1 can support a peer that is configured for LDP SSO/NSF as the peer recovers from an outage.
B. R1can support a graceful restart operation on the peer, even if graceful restart is disabled on the peer.
C. R1 can failover to any peer.
D. R1 can failover only to a peer that is configured for LDF SSO/NSF.

Show Suggested Answer

Suggested Answer: A 🗳️
Reference:
https://www.cisco.com/en/US/docs/general/Test/kwoodwar/fsgr29s.html

by ibrahv at Feb. 13, 2021, 2:59 p.m.

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thejag

2 years, 4 months ago

Selected Answer: A

From the reference: When you enable MPLS LDP GR on a router that peers with an MPLS LDP SSO/NSF-enabled router, the SSO/NSF-enabled router can maintain its forwarding state when the LDP session between them is interrupted. While the SSO/NSF-enabled router recovers, the peer router forwards packets using stale information. This enables the SSO/NSF-enabled router to become operational more quickly.

upvoted 1 times

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NetworkYoda72

2 years, 8 months ago

Selected Answer: A

A. The key word here is support. GR is supporting of a neighbor that is converging after outage. We are not failing over to that peer.

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Charybdis

2 years, 10 months ago

D: Is correct, but it has a typo, it is not "LDF", it is LDP.

upvoted 1 times

sharon90

6 months, 1 week ago

so it is not correct... and that's not a typo, it was done on purpose just to exclude this answer if you studied a little bit...

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EdgardoAC

3 years, 5 months ago

A is correct, there is no such thing as "LDF" SSO/NSF. It is a trick question, read the options very carefully.

upvoted 1 times

EdgardoAC

3 years, 5 months ago

I managed to get a hold of another dump, this question is also in that one and the answer is also A, even though option D states LDP SSO/NSF, not "LDF" SSO/NSF.

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sherlock0

3 years, 6 months ago

A is Correct

upvoted 2 times

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murmelika

4 years ago

D most correct?? "MPLS LDP GR functions strictly in helper mode, which means it can ONLY help other routers that are enabled with MPLS SSO/NSF and GR to recover." https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ha/configuration/xe-3s/mp-ha-xe-3s-book/mp-ldp-grace-rstrt.html

upvoted 1 times