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Exam 350-501 topic 1 question 285 discussion

Actual exam question from Cisco's 350-501
Question #: 285
Topic #: 1
[All 350-501 Questions]


Refer to the exhibit. An engineer at ISP C is configuring a new interconnection with ISPs A and B using the BGP protocol. After the initial configuration, the engineer noticed high memory usage and an abnormally large LIB table on router R2. Which two actions must the engineer take on R2 to minimize memory usage? (Choose two.)

  • A. Configure the mpls ldp neighbor 11.11.11.11 labels accept 1 command.
  • B. Configure Standard ACL 1 with accepted prefixes.
  • C. Configure Extended ACL 101 with accepted prefixes.
  • D. Configure the mpls ldp neighbor 1.1.1.1 labels accept 101 command.
  • E. Configure the mpls ldp neighbor 21.21.21.21 labels accept 101 command.
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Suggested Answer: AB 🗳️
by Benxi at March 16, 2023, 1:31 a.m.

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sushil_bhattacharjee
11 months, 2 weeks ago
The MPLS network is limited to Provider Edge Router "R1" and "R2". Hence, why would we think to build MPLS neighbourship with the ISP router!! R2 is getting heaps of routes update from the ISP. Hence, it requires to limit the incoming routes from the ISP to the MPLS core.
upvoted 1 times
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JoostAtExamtopics
1 year, 9 months ago
I was breaking my head about this cause, why having LDP on a peering with another ISP using BGP (eBGP I take it). Here you would normally use labelled-unicast... Then, I found this link by Benxi and saw that only standard ACLs are allowed for inbound filtering. So this got my mind to think it must indeed be A & C.
upvoted 2 times
JoostAtExamtopics
1 year, 9 months ago
Typo .., A & B.
upvoted 1 times
Mike_Rowehard
11 months, 1 week ago
This is a classic case of "this is such a bad answer, but it's the only one that actually works." The question doesn't explain WHY we're running LDP with a different ISP, which is a heck of a "demands explanation" scenario, lol. I've enjoyed a lot of Cisco's exams in the past. This one wasn't so great because of these exact sorts of things.
upvoted 1 times
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thejag
1 year, 10 months ago
A and B looks correct
upvoted 1 times
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Benxi
1 year, 10 months ago
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/15-s/mp-ldp-15-s-book/mp-ldp-inbound-filtr.html
upvoted 1 times
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Community vote distribution
A (35%)
C (25%)
B (20%)
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