ANS-C01 Network Management and Operations Practice Question
A company uses AWS Direct Connect to connect its on-premises network to a VPC. The connection uses a private virtual interface (VIF) to access the VPC. The network team is monitoring the link and notices that the BGP session goes down intermittently. The team has checked the physical layer and found no issues. The BGP keepalive timer is set to 30 seconds on both sides. The network engineer suspects that the issue might be related to the BGP hold timer. What should the engineer do to stabilize the BGP session?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the BGP hold timer to 90 seconds on both the on-premises router and the AWS side.
Increasing the BGP hold timer to 90 seconds on both the on-premises router and the AWS side allows more time to receive keepalive messages, reducing the likelihood of the session going down due to transient network issues or slight delays. This stabilizes the BGP session without changing the underlying physical connection. Option A is incorrect because a static route would bypass BGP and remove the dynamic routing benefits. Option B is incorrect because decreasing the hold timer makes the session more sensitive to delays, worsening the flapping. Option D is incorrect because changing to a public VIF does not affect BGP stability and is unrelated to the hold timer issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure a static route on the on-premises router for the VPC CIDR.
Why it's wrong here
Incorrect: Static routes do not provide dynamic failover and may cause blackholing.
- ✗
Decrease the BGP hold timer to 10 seconds on the on-premises router.
Why it's wrong here
Incorrect: Decreasing the hold timer increases sensitivity and may cause more flapping.
- ✓
Increase the BGP hold timer to 90 seconds on both the on-premises router and the AWS side.
Why this is correct
Correct: A higher hold timer reduces the chance of BGP session flapping due to intermittent connectivity.
- ✗
Change the virtual interface to a public VIF to improve BGP stability.
Why it's wrong here
Incorrect: Public VIF is for accessing public AWS services, not private VPC.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.