- A
The condition key aws:SourceVpce
Correct. `aws:SourceVpce` is a condition key, not a principal, but it is the standard way to restrict access to a specific VPC endpoint in an S3 bucket policy. The question's phrasing is technically imprecise; the correct method uses this condition key in the Condition element.
- B
The VPC ID
Why wrong: Incorrect. The VPC ID alone cannot be used to restrict access; you must specify the VPC endpoint ID using the `aws:SourceVpce` condition key.
- C
The ARN of the VPC endpoint
Why wrong: Incorrect. The ARN of the VPC endpoint is not used as a principal or condition key in S3 bucket policies for this purpose.
- D
The VPC endpoint service
Why wrong: Incorrect. A VPC endpoint service is not a principal and is not used in S3 bucket policies to restrict access to a specific endpoint.
Restrict S3 Bucket Access to VPC Endpoint
This ANS-C01 practice question tests your understanding of network security, compliance and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: aws:SourceVpce condition key. 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 CloudFormation to deploy a stack that includes an S3 bucket with a bucket policy that restricts access to a specific VPC endpoint. The stack fails to create, and the error indicates that the bucket policy contains an invalid principal. Which principal should be used to restrict access to a VPC endpoint?
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 condition key aws:SourceVpce
The question asks for a 'principal' to restrict access to a VPC endpoint, but technically you cannot use a VPC endpoint as a principal in an S3 bucket policy. Instead, S3 bucket policies use the `aws:SourceVpce` condition key in the `Condition` element to restrict access to a specific VPC endpoint by specifying its ID. While `aws:SourceVpce` is not a principal, it is the correct and recommended method. Option A is the correct choice because it identifies the condition key used for this purpose. Option B (VPC ID) is incorrect because you need the VPC endpoint ID, not the VPC ID. Option C (ARN of the VPC endpoint) is incorrect because ARNs are not used as principals in this context. Option D (VPC endpoint service) is incorrect because the endpoint service is not a principal.
Key principle: aws:SourceVpce condition key
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 condition key aws:SourceVpce
Why this is correct
Correct. `aws:SourceVpce` is a condition key, not a principal, but it is the standard way to restrict access to a specific VPC endpoint in an S3 bucket policy. The question's phrasing is technically imprecise; the correct method uses this condition key in the Condition element.
Related concept
aws:SourceVpce condition key
- ✗
The VPC ID
Why it's wrong here
Incorrect. The VPC ID alone cannot be used to restrict access; you must specify the VPC endpoint ID using the `aws:SourceVpce` condition key.
- ✗
The ARN of the VPC endpoint
Why it's wrong here
Incorrect. The ARN of the VPC endpoint is not used as a principal or condition key in S3 bucket policies for this purpose.
- ✗
The VPC endpoint service
Why it's wrong here
Incorrect. A VPC endpoint service is not a principal and is not used in S3 bucket policies to restrict access to a specific endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The question deliberately uses the word 'principal' to mislead. The correct approach uses a condition key (`aws:SourceVpce`), not a principal. Candidates often choose the VPC endpoint ARN or ID thinking they are principals.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- aws:SourceVpce condition key
- Principal vs Condition
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
aws:SourceVpce condition key
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 Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — aws:SourceVpce condition key.
What is the correct answer to this question?
The correct answer is: The condition key aws:SourceVpce — The question asks for a 'principal' to restrict access to a VPC endpoint, but technically you cannot use a VPC endpoint as a principal in an S3 bucket policy. Instead, S3 bucket policies use the `aws:SourceVpce` condition key in the `Condition` element to restrict access to a specific VPC endpoint by specifying its ID. While `aws:SourceVpce` is not a principal, it is the correct and recommended method. Option A is the correct choice because it identifies the condition key used for this purpose. Option B (VPC ID) is incorrect because you need the VPC endpoint ID, not the VPC ID. Option C (ARN of the VPC endpoint) is incorrect because ARNs are not used as principals in this context. Option D (VPC endpoint service) is incorrect because the endpoint service is not a principal.
What should I do if I get this ANS-C01 question wrong?
Review aws:SourceVpce condition key, then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
aws:SourceVpce condition key
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Last reviewed: Jun 20, 2026
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