- A
Bucket policy with condition aws:SourceVpc
Correct. The aws:SourceVpc condition key in a bucket policy restricts access to traffic from the specified VPC.
- B
Bucket policy with condition aws:SourceIp
Why wrong: Incorrect. Using aws:SourceIp requires knowing all IP addresses used in the VPC, which is less manageable and may not cover all traffic.
- C
Bucket ACL with VPC ID
Why wrong: Incorrect. Bucket ACLs do not support VPC-based restrictions.
- D
VPC Endpoint policy
Why wrong: Incorrect. A VPC Endpoint policy controls what actions are allowed from the endpoint, but it does not restrict access to the bucket from other sources. Combining endpoint policy with bucket policy is possible, but the question asks for a single configuration to restrict to that VPC, and the bucket policy with aws:SourceVpc is the direct method.
DVA-C02 Security Practice Question
This DVA-C02 practice question tests your understanding of security. 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 wants to restrict access to an Amazon S3 bucket so that only requests originating from a specific Amazon VPC are allowed. The bucket is in the same AWS account as the VPC. Which configuration should the developer implement?
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
Bucket policy with condition aws:SourceVpc
Option A is correct because the `aws:SourceVpc` condition key in an S3 bucket policy allows you to restrict access to requests originating from a specific VPC. This works in conjunction with a VPC endpoint for S3 (Gateway or Interface endpoint), which ensures that traffic from the VPC to S3 stays within the AWS network and does not traverse the public internet. The condition evaluates the VPC ID from which the request originates, providing a secure, network-level access control.
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.
- ✓
Bucket policy with condition aws:SourceVpc
Why this is correct
Correct. The aws:SourceVpc condition key in a bucket policy restricts access to traffic from the specified VPC.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Bucket policy with condition aws:SourceIp
Why it's wrong here
Incorrect. Using aws:SourceIp requires knowing all IP addresses used in the VPC, which is less manageable and may not cover all traffic.
- ✗
Bucket ACL with VPC ID
Why it's wrong here
Incorrect. Bucket ACLs do not support VPC-based restrictions.
- ✗
VPC Endpoint policy
Why it's wrong here
Incorrect. A VPC Endpoint policy controls what actions are allowed from the endpoint, but it does not restrict access to the bucket from other sources. Combining endpoint policy with bucket policy is possible, but the question asks for a single configuration to restrict to that VPC, and the bucket policy with aws:SourceVpc is the direct method.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `aws:SourceVpc` with `aws:SourceIp` or think a VPC Endpoint policy alone can restrict bucket access, but the bucket policy is the authoritative mechanism for inbound access control, while the endpoint policy governs outbound permissions from the VPC.
Detailed technical explanation
How to think about this question
The `aws:SourceVpc` condition key works only when the request is made through a VPC endpoint (Gateway or Interface endpoint) for S3. Under the hood, AWS attaches a special header to requests from the endpoint that includes the VPC ID, which S3 then evaluates against the bucket policy condition. A common subtlety is that if the bucket policy uses `aws:SourceVpc`, it must also explicitly deny requests that do not come through a VPC endpoint (e.g., from the public internet) to fully enforce the restriction, otherwise the condition only applies to endpoint-originated requests and other requests are evaluated separately.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Security — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Bucket policy with condition aws:SourceVpc — Option A is correct because the `aws:SourceVpc` condition key in an S3 bucket policy allows you to restrict access to requests originating from a specific VPC. This works in conjunction with a VPC endpoint for S3 (Gateway or Interface endpoint), which ensures that traffic from the VPC to S3 stays within the AWS network and does not traverse the public internet. The condition evaluates the VPC ID from which the request originates, providing a secure, network-level access control.
What should I do if I get this DVA-C02 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: Jun 11, 2026
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