Exam 350-501 topic 1 question 311 discussion

Actual exam question from Cisco's 350-501

Question #: 311
Topic #: 1

A new PE router is configured to run OSPF as an IGP with LDP on all interfaces. The engineer is trying to prevent black holes after convergence when the
PERSON device loses an LDP session with other PE routers. Which action must the engineer take to implement LDP session protection on a new PE router?

A. Configure the mpls ldp session protection and mpls label protocol ldp commands on the interfaces on the new PE router that connect to the CENTER routers.
B. Configure the mpls ldp discovery targeted-hello accept and mpls ldp session protection commands on the interfaces on the new PE router that connect to the CE routers.
C. Configure the new PE router with the mpls ldp session protection command and on neighboring routers that connect to this new PE router.
D. Configure the new PE router with the mpls ldp session protection command on interfaces with directly connected neighbors.

Show Suggested Answer

Suggested Answer: C 🗳️

by thejag at March 10, 2023, 2:54 p.m.

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joeneo

10 months, 2 weeks ago

option C

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chst

1 year, 3 months ago

It's C , MPLS LDP session protection isn't configure under interfaces

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thejag

1 year, 3 months ago

Good point, the actual command is global, not an interface command. Trick question. C is correct as it needs to be configured on this and neighboring routers. "MPLS LDP Session Protection protects an LDP session between directly connected neighbors or an LDP session established for a traffic engineering (TE) tunnel."

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1234512345

1 year, 3 months ago

For me C is better, you need to configure both sides.

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thejag

1 year, 4 months ago

Answer D? The MPLS LDP Session Protection feature provides faster Label Distribution Protocol (LDP) convergence when a link recovers following an outage. MPLS LDP Session Protection protects an LDP session between DIRECTLY CONNECTED neighbors or an LDP session established for a traffic engineering (TE) tunnel. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/15-s/mp-ldp-15-s-book/mp-ldp-sessn-prot.pdf

upvoted 1 times

Totalstranger

1 year, 1 month ago

But it says on D that it needs to be configure on interfaces, which is wrong

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