- A
The VPC does not have a VPC endpoint for S3
Why wrong: VPC endpoint is optional; public VIF can access S3 directly.
- B
The public VIF is not associated with the correct Direct Connect gateway
Why wrong: Association is likely correct if other routes work.
- C
The on-premises router is not advertising the S3 prefix list via BGP over the public VIF
S3 prefix must be advertised to route traffic over Direct Connect.
- D
The route table in the VPC does not have a route to the S3 prefix list via the virtual private gateway
Why wrong: Route exists as stated.
Question 1,130 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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. They notice that traffic to S3 is taking a suboptimal path (going through the internet) instead of the Direct Connect connection. The VPC has a route table with a route for S3 prefix list via the virtual private gateway. What is the most likely cause?
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 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 is not advertising the S3 prefix list via BGP over the public VIF
For traffic to use the Direct Connect public VIF, the on-premises router must advertise the specific prefixes (e.g., S3 prefix list) via BGP over the public VIF. Without this advertisement, the on-premises router will not have a route pointing to the Direct Connect link for S3 traffic, causing it to fall back to the internet path. The VPC route table already has a route for the S3 prefix list via the virtual private gateway, so the issue lies in the BGP advertisement from the on-premises side.
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.
- ✗
The VPC does not have a VPC endpoint for S3
Why it's wrong here
VPC endpoint is optional; public VIF can access S3 directly.
- ✗
The public VIF is not associated with the correct Direct Connect gateway
Why it's wrong here
Association is likely correct if other routes work.
- ✓
The on-premises router is not advertising the S3 prefix list via BGP over the public VIF
Why this is correct
S3 prefix must be advertised to route traffic over Direct Connect.
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.
- ✗
The route table in the VPC does not have a route to the S3 prefix list via the virtual private gateway
Why it's wrong here
Route exists as stated.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the VPC route table configuration is sufficient, but they overlook that the on-premises router must also advertise the destination prefixes via BGP over the public VIF for traffic to use the Direct Connect path.
Detailed technical explanation
How to think about this question
A public VIF uses BGP to exchange routes between the on-premises router and AWS. The on-premises router must advertise the prefixes it wants to reach (e.g., S3 service prefixes) so that AWS can forward traffic accordingly. If the on-premises router does not advertise these prefixes, the traffic will be routed via the default internet path instead of the Direct Connect link. This is a common misconfiguration when setting up public VIFs for accessing AWS public services.
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.
TExam Day Tips
- 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.
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 |
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The on-premises router is not advertising the S3 prefix list via BGP over the public VIF — For traffic to use the Direct Connect public VIF, the on-premises router must advertise the specific prefixes (e.g., S3 prefix list) via BGP over the public VIF. Without this advertisement, the on-premises router will not have a route pointing to the Direct Connect link for S3 traffic, causing it to fall back to the internet path. The VPC route table already has a route for the S3 prefix list via the virtual private gateway, so the issue lies in the BGP advertisement from the on-premises side.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
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Last reviewed: Jul 4, 2026
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