- A
Allow all traffic to the AWS region's IP range.
Why wrong: Allowing all region IPs is too permissive.
- B
Set up a Site-to-Site VPN tunnel over Direct Connect.
Why wrong: VPN over Direct Connect is not needed for S3 access.
- C
Use a private virtual interface and connect through a VPC endpoint.
Why wrong: Private VIF is for VPC, not direct S3 access.
- D
Use the S3 IP prefix list from AWS to create firewall rules.
Prefix lists provide specific S3 IP addresses.
Question 1,079 of 1,705
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is using AWS Direct Connect with a public virtual interface to access Amazon S3. The on-premises network has a firewall that only allows traffic to specific IP prefixes. What is the best practice to ensure connectivity while maintaining security?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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 S3 IP prefix list from AWS to create firewall rules.
Option D is correct because AWS publishes managed prefix lists for each service, including Amazon S3, which contain the specific IP prefixes used by S3 in each region. By using these prefix lists in firewall rules, you can allow only the necessary S3 traffic while maintaining strict security, rather than permitting the entire region's IP range. This approach aligns with the principle of least privilege and ensures connectivity over the public VIF without exposing on-premises networks to unnecessary traffic.
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.
- ✗
Allow all traffic to the AWS region's IP range.
Why it's wrong here
Allowing all region IPs is too permissive.
- ✗
Set up a Site-to-Site VPN tunnel over Direct Connect.
Why it's wrong here
VPN over Direct Connect is not needed for S3 access.
- ✗
Use a private virtual interface and connect through a VPC endpoint.
Why it's wrong here
Private VIF is for VPC, not direct S3 access.
- ✓
Use the S3 IP prefix list from AWS to create firewall rules.
Why this is correct
Prefix lists provide specific S3 IP addresses.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that a private VIF or VPN is required for secure access to AWS services, when in fact a public VIF with service-specific prefix lists provides a secure and simpler solution for accessing public services like S3.
Detailed technical explanation
How to think about this question
AWS S3 IP prefix lists are maintained in the 'AWS-managed prefix list' resource (e.g., 'com.amazonaws.region.s3') and are updated automatically as S3 endpoints change. When using a public VIF, traffic to S3 traverses the AWS public internet backbone, but the prefix list ensures that only S3-specific IPs are allowed through the on-premises firewall, reducing the risk of misrouting or unauthorized access. In practice, this is often combined with AWS Transit Gateway or Direct Connect Gateway for multi-account scenarios, but the core principle remains: use service-specific prefix lists for firewall rules.
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
Got this wrong? Here's your next step.
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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 S3 IP prefix list from AWS to create firewall rules. — Option D is correct because AWS publishes managed prefix lists for each service, including Amazon S3, which contain the specific IP prefixes used by S3 in each region. By using these prefix lists in firewall rules, you can allow only the necessary S3 traffic while maintaining strict security, rather than permitting the entire region's IP range. This approach aligns with the principle of least privilege and ensures connectivity over the public VIF without exposing on-premises networks to unnecessary traffic.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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