The answer is to configure BGP route filtering on the customer router to limit the number of routes advertised to AWS to no more than 100. This stabilizes the Direct Connect public VIF BGP session because AWS enforces a hard limit of 100 prefixes on a public virtual interface; advertising more than this threshold triggers the session to flap as AWS repeatedly rejects the excess routes, causing the BGP hold timer to expire. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of Direct Connect public VIF constraints versus private VIF limits, where the private VIF allows up to 1,000 routes—a common trap is confusing the two. A reliable memory tip is “Public VIF = 100 prefixes, Private VIF = 1,000,” so when you see BGP flapping on a public VIF, always suspect route count overflow first.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 with a public VIF to access Amazon S3. The on-premises network team reports that the BGP session for the public VIF is flapping intermittently. Which configuration change on the customer router would most likely 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure BGP route filtering to limit the number of routes advertised to AWS to no more than 100.
BGP flapping due to route advertisements exceeding the maximum allowed is a known issue. The maximum number of routes allowed on a public VIF is 100. Advertising more than this will cause the session to flap. Limiting routes to 100 will stabilize.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Set the BGP multi-hop TTL to 255.
Why it's wrong here
Multi-hop TTL is not related to route advertisement limits.
✓
Configure BGP route filtering to limit the number of routes advertised to AWS to no more than 100.
Why this is correct
AWS limits public VIF to 100 prefixes; exceeding causes 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.
✗
Increase the BGP hold timer to 180 seconds.
Why it's wrong here
Increasing hold timer may hide the issue but does not address the root cause; flapping might still occur.
✗
Disable BGP fast-external-fallover on the customer router.
Why it's wrong here
This would prevent fast failover but not address route advertisement limits.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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
How to think about this question
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.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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 Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure BGP route filtering to limit the number of routes advertised to AWS to no more than 100. — BGP flapping due to route advertisements exceeding the maximum allowed is a known issue. The maximum number of routes allowed on a public VIF is 100. Advertising more than this will cause the session to flap. Limiting routes to 100 will stabilize.
What should I do if I get this ANS-C01 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
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 →
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.
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.