Quick Answer
The answer is to adjust BGP timers to match between the on-premises router and the AWS virtual private gateway. A mismatch in the keepalive and hold timers causes the BGP session to flap because one side expects a message within a shorter interval than the other, leading to premature session resets when the hold timer expires. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of BGP session stability fundamentals, often disguised as a complex routing policy issue. A common trap is to assume ASN prepending or route-maps are needed, but the VGW does not support route-maps, and prepending only influences path selection, not session uptime. Remember the memory tip: “Timers must be twins—if they don’t match, the session will scratch.”
This ANS-C01 practice question tests your understanding of network security, compliance and governance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Add ASN prepending to the advertised prefix.
Why wrong: Affects route preference, not session stability.
Adjust BGP timers (keepalive and hold time) to match between the on-premises router and the VGW.
Mismatched timers can cause flapping.
Enable BGP MD5 authentication on both sides.
Why wrong: Does not address flapping.
Apply a route-map on the VGW to filter the prefix.
Why wrong: VGW does not support route-maps.
Answer choices
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.
Option C is correct because BGP timers mismatch can cause flapping; adjusting them to match stabilizes the session. Option A is wrong because MD5 authentication is for security, not flapping. Option B is wrong because ASN prepending affects route selection, not stability. Option D is wrong because VGW does not support route-maps.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
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.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Security, Compliance and Governance — study guide chapter
Learn the concepts, then practise the questions
Network Security, Compliance and Governance practice questions
Targeted practice on this topic area only
All ANS-C01 questions
1,705 questions across all exam domains
AWS Certified Advanced Networking Specialty ANS-C01 study guide
Full concept coverage aligned to exam objectives
ANS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise ANS-C01 questions linked to Network Management and Operations.
Practise ANS-C01 questions linked to Network Security, Compliance and Governance.
Practise ANS-C01 questions linked to Network Design.
Practise ANS-C01 questions linked to Network Implementation.
Practise ANS-C01 questions linked to ANS-C01 fundamentals.
Practise ANS-C01 questions linked to ANS-C01 scenario.
Practise ANS-C01 questions linked to ANS-C01 troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
The correct answer is: Adjust BGP timers (keepalive and hold time) to match between the on-premises router and the VGW. — Option C is correct because BGP timers mismatch can cause flapping; adjusting them to match stabilizes the session. Option A is wrong because MD5 authentication is for security, not flapping. Option B is wrong because ASN prepending affects route selection, not stability. Option D is wrong because VGW does not support route-maps.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 20, 2026
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.