ANS-C01 Network Security, Compliance and Governance Practice Question
A company wants to restrict access to an S3 bucket so that only requests from a specific VPC endpoint are allowed. Which type of policy should they use?
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
✓
S3 bucket policy with aws:SourceVpce condition
S3 bucket policies can use the aws:SourceVpce condition key to restrict access to requests originating from a specific VPC endpoint. Option B is incorrect because aws:SourceIp condition is not effective for traffic coming through a VPC endpoint, as the source IP is the endpoint's private IP, not the client's IP. Option C is incorrect because IAM policies control user and role permissions, not network-level access control. Option D is incorrect because VPC endpoint policies control what actions can be performed via the endpoint, but they do not replace bucket policies for restricting access to the S3 bucket itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
S3 bucket policy with aws:SourceVpce condition
Why this is correct
Bucket policies can restrict access based on VPC endpoint ID.
- ✗
S3 bucket policy with aws:SourceIp condition
Why it's wrong here
SourceIp does not work for traffic originating from a VPC endpoint.
- ✗
IAM policy
Why it's wrong here
IAM policies control user permissions, not network access.
- ✗
VPC endpoint policy
Why it's wrong here
Endpoint policy controls what actions can be performed via the endpoint, not which endpoints can access the bucket.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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