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Exam 400-201 topic 1 question 190 discussion

Actual exam question from Cisco's 400-201
Question #: 190
Topic #: 1
[All 400-201 Questions]

On the BGP Best Path Selection, when two external paths from different EBGP neighbors are received, the oldest path received can be the tie break to select the best path. Which Cisco IOS command ignores this decision criteria and checks the next decision criteria?

  • A. bgp best path med missing-as-worst
  • B. bgp best path compare-routerid
  • C. bgp best path cost-community ignore
  • D. bgp best path as-path ignore
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Suggested Answer: B 🗳️
Reference:
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html
by Gi0v4ne at Nov. 30, 2021, 10:43 p.m.

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Gi0v4ne
3 years, 4 months ago
Selected Answer: B
When both paths are external, prefer the path that was received first (the oldest one). This step minimizes route-flap because a newer path does not displace an older one, even if the newer path would be the preferred route based on the next decision criteria (Steps 11, 12, and 13). Skip this step if any of these items is true: You have enabled the bgp best path compare-routerid command.
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