ANS-C01 Network Security, Compliance and Governance Practice Question
A company uses AWS Direct Connect to connect its on-premises data center to AWS. The network team notices that the BGP session between the on-premises router and the AWS virtual private gateway (VGW) is flapping. The on-premises router is configured to advertise a specific prefix. Which configuration change is MOST likely 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
✓
Adjust BGP timers (keepalive and hold time) to match between the on-premises router and the VGW.
BGP timers mismatch (keepalive and hold time) can cause frequent session resets (flapping). Adjusting them to match between the on-premises router and the VGW stabilizes the session. Option A is incorrect because ASN prepending influences route preference, not session stability. Option C is incorrect because MD5 authentication is for security, not flapping. Option D is incorrect because VGW does not support route-maps for filtering prefixes (route filtering can be done via allowed prefixes but not route-maps).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add ASN prepending to the advertised prefix.
Why it's wrong here
Affects route preference, not session stability.
- ✓
Adjust BGP timers (keepalive and hold time) to match between the on-premises router and the VGW.
Why this is correct
Mismatched timers can cause flapping.
- ✗
Enable BGP MD5 authentication on both sides.
Why it's wrong here
Does not address flapping.
- ✗
Apply a route-map on the VGW to filter the prefix.
Why it's wrong here
VGW does not support route-maps.
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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.