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Exam 300-410 topic 1 question 67 discussion

Actual exam question from Cisco's 300-410
Question #: 67
Topic #: 1
[All 300-410 Questions]

Refer to the exhibit.


AS111 is receiving its own routes from AS200 causing a loop in the network.
Which configuration provides loop prevention?

  • A. router bgp 111 neighbor 195.1.1.1 as-override no neighbor 195.1.2.2 allowas-in
  • B. router bgp 111 no neighbor 195.1.1.1 allowas-in no neighbor 195.1.2.2 allowas-in
  • C. router bgp 111 neighbor 195.1.2.2 as-override no neighbor 195.1.1.1 allowas-in
  • D. router bgp 111 neighbor 195.1.1.1 as-override neighbor 195.1.2.2 as-override
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by Carl1999 at Feb. 2, 2022, 3:38 p.m.

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MasoudGhorbani
Highly Voted 1 year, 3 months ago
Selected Answer: B
the allowas-in command is used to allow prefixes to be received by the router even if they contain its own AS number in the AS_PATH. the best option is to stop accepting routes containing AS111's own AS number
upvoted 5 times
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[Removed]
Most Recent 10 months, 2 weeks ago
Selected Answer: B
B is correct
upvoted 1 times
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Colmenarez
1 year, 8 months ago
This reminds me of an encore lab question.
upvoted 3 times
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xziomal9
3 years ago
Selected Answer: B
The correct answer is: B router bgp 111 no neighbor 195.1.1.1 allowas-in no neighbor 195.1.2.2 allowas-in
upvoted 2 times
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Carl1999
3 years, 3 months ago
B is correct. In this case, Allow as-in is not needed. Because it disables control of AS_PATH.
upvoted 2 times
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