- A
Establish a VPN connection over the Direct Connect private VIF and route S3 traffic through the VPN.
Why wrong: This adds unnecessary overhead and does not leverage the public VIF for direct access.
- B
Use the public virtual interface and configure a route filter to only accept routes for the S3 service.
A public VIF provides access to AWS public services, and route filters can restrict which prefixes are advertised.
- C
Create a private virtual interface and attach it to the VPC.
Why wrong: A private VIF provides connectivity to VPC private IP addresses, not AWS public services like S3.
- D
Create a Direct Connect gateway and associate the public VIF with it.
Why wrong: Direct Connect gateway is for private VIFs to connect to multiple VPCs, not for public VIFs.
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 has a Direct Connect connection with a public virtual interface (VIF) to access AWS public services. They want to ensure that all traffic to Amazon S3 from on-premises uses the Direct Connect connection instead of the internet. Which configuration is required?
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
Use the public virtual interface and configure a route filter to only accept routes for the S3 service.
Option B is correct because a public virtual interface (VIF) provides direct connectivity to AWS public services, including Amazon S3, over the Direct Connect link. By default, the public VIF advertises a default route or specific AWS public prefixes; you must configure a route filter to accept only the S3 service prefixes (e.g., from the S3 service-specific prefix list) to ensure all S3 traffic uses the Direct Connect connection instead of the internet. This prevents any other public traffic from using the link and enforces the desired routing behavior.
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.
- ✗
Establish a VPN connection over the Direct Connect private VIF and route S3 traffic through the VPN.
Why it's wrong here
This adds unnecessary overhead and does not leverage the public VIF for direct access.
- ✓
Use the public virtual interface and configure a route filter to only accept routes for the S3 service.
Why this is correct
A public VIF provides access to AWS public services, and route filters can restrict which prefixes are advertised.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a private virtual interface and attach it to the VPC.
Why it's wrong here
A private VIF provides connectivity to VPC private IP addresses, not AWS public services like S3.
- ✗
Create a Direct Connect gateway and associate the public VIF with it.
Why it's wrong here
Direct Connect gateway is for private VIFs to connect to multiple VPCs, not for public VIFs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse public VIFs with private VIFs, assuming a private VIF is needed for any AWS service access, or they think a VPN or Direct Connect gateway is required to secure or direct S3 traffic, when in fact a public VIF with proper route filtering is the correct and simplest solution.
Detailed technical explanation
How to think about this question
Under the hood, a public VIF uses BGP to exchange routes with AWS, and AWS advertises a set of public IP prefixes for its services. To restrict traffic to only S3, you must apply a route filter on the on-premises router that accepts only the S3-specific prefixes (e.g., from the AWS S3 prefix list), which are typically in the 52.84.0.0/15 or 54.231.0.0/16 ranges. In a real-world scenario, failing to filter routes could cause all internet-bound traffic to use the Direct Connect link, leading to unexpected bandwidth consumption and potential routing loops.
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.
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 |
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: Use the public virtual interface and configure a route filter to only accept routes for the S3 service. — Option B is correct because a public virtual interface (VIF) provides direct connectivity to AWS public services, including Amazon S3, over the Direct Connect link. By default, the public VIF advertises a default route or specific AWS public prefixes; you must configure a route filter to accept only the S3 service prefixes (e.g., from the S3 service-specific prefix list) to ensure all S3 traffic uses the Direct Connect connection instead of the internet. This prevents any other public traffic from using the link and enforces the desired routing behavior.
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.
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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