ANS-C01 Network Management and Operations Practice Question
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?
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
✓
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.
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.
- ✗
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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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.