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Exam AWS Certified Advanced Networking - Specialty ANS-C01 All Questions

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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 146 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 146
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has critical VPC workloads that connect to an on-premises data center through two redundant active-passive AWS Direct Connect connections. However, a recent outage on one Direct Connect connection revealed that it takes more than a minute for traffic to fail over to the secondary Direct Connect connection. The company wants to reduce the failover time from minutes to seconds.

Which solution will provide the LARGEST reduction in the BGP failover time?

  • A. Reduce the BGP hold-down timer that is configured on the BGP sessions on the Direct Connect connection VIFs.
  • B. Configure an Amazon CloudWatch alarm for the Direct Connect connection state to invoke an AWS Lambda function to fail over the traffic.
  • C. Configure Bidirectional Forwarding Detection (BFD) on the Direct Connect connections on the AWS side.
  • D. Configure Bidirectional Forwarding Detection (BFD) on the Direct Connect connections on the on-premises router.
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Suggested Answer: D 🗳️
by Neo00 at July 25, 2023, 6:47 p.m.
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Neo00
Highly Voted 1 year, 3 months ago
Selected Answer: D
Asynchronous BFD is automatically turned on for all AWS Direct Connect interfaces on the AWS side. You can't configure BFD settings on the AWS side. When creating a BFD session, the BFD protocol always selects the longer and slower timer.
upvoted 5 times
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Certified101
Most Recent 1 year, 3 months ago
Selected Answer: D
D is correct
upvoted 1 times
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ISSDoksim
1 year, 3 months ago
agreed - D
upvoted 1 times
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Manh
1 year, 3 months ago
it's D. https://docs.aws.amazon.com/directconnect/latest/UserGuide/Welcome.html By enabling BFD on both sides of the Direct Connect connection, you can reduce the BGP failover time from minutes to seconds. BFD allows the BGP neighbor relationship to be quickly torn down when a failure is detected on the Direct Connect connection. Otherwise, by default, BGP waits for three keep-alives to fail at a hold-down time of 90 seconds.
upvoted 1 times
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