ANS-C01 Network Management and Operations Practice Question
A company has a Direct Connect connection with a public VIF to access AWS public services. They notice that traffic to Amazon S3 is taking a suboptimal path via the internet instead of the Direct Connect. What is the MOST likely cause?
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
✓
The on-premises router does not have a route for the S3 CIDR ranges pointing to the Direct Connect
The most likely cause is that the on-premises router does not have a route for the S3 CIDR ranges pointing to the Direct Connect interface. Even though the public VIF is established and BGP is advertising the appropriate prefixes, the on-premises router must have a specific route directing S3 traffic to the Direct Connect. Without this route, traffic will take the default path via the internet. Option A is incorrect because BGP for public VIFs does advertise prefixes, including S3. Option B is incorrect because a 'DOWN' state would prevent all traffic, not just suboptimal routing. Option D is incorrect because a virtual private gateway is not used with a public VIF.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The BGP session for the public VIF is not advertising the S3 prefixes
Why it's wrong here
Public VIF uses BGP to receive prefixes, not advertise.
- ✗
The public VIF is in a 'DOWN' state
Why it's wrong here
Would affect all traffic, not just S3.
- ✓
The on-premises router does not have a route for the S3 CIDR ranges pointing to the Direct Connect
Why this is correct
Need to route S3 traffic over Direct Connect.
- ✗
The virtual private gateway is not attached to the VPC
Why it's wrong here
Public VIF does not use virtual private gateway.
Visual reference
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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JA
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.