DEA-C01 Data Security and Governance Practice Question
A data engineer needs to ensure that an S3 bucket can only be accessed from a specific VPC. Which policy element should be used?
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 condition key aws:SourceVpc in the bucket policy.
The condition key aws:SourceVpc restricts requests to originate from a specific VPC. Option C (aws:SourceVpce) limits access to a VPC endpoint, not the VPC itself. Option B (aws:SourceIp) restricts by IP address, not VPC. Option A (aws:VpcSourceIp) is not a valid 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.
- ✗
Use the condition key aws:VpcSourceIp in the bucket policy.
Why it's wrong here
aws:VpcSourceIp matches the private IP address a request originates from, so it cannot identify which VPC sent the request and is spoofable across peered networks. It is tempting because it references a VPC, but it is intended for restricting access to specific private IP ranges, not for binding a bucket to one VPC.
- ✗
Use the condition key aws:SourceIp in the bucket policy.
Why it's wrong here
aws:SourceIp matches the public IP address of the caller, which for VPC endpoints is the endpoint's private address, so it cannot reliably identify the originating VPC. It is tempting because it restricts access by network origin, but it suits public IP allow-listing rather than VPC-scoped access.
- ✗
Use the condition key aws:SourceVpce in the bucket policy.
Why it's wrong here
aws:SourceVpce matches the VPC endpoint ID, not the VPC itself, so it restricts access to one endpoint rather than every request originating from the specified VPC. It is tempting because it is VPC-related, but it is intended for endpoint-specific policies, not whole-VPC restriction.
- ✓
Use the condition key aws:SourceVpc in the bucket policy.
Why this is correct
The aws:SourceVpc condition key evaluates the VPC endpoint through which the request arrives, so the bucket policy denies any traffic not originating from the specified VPC. This directly satisfies the requirement that the bucket be accessible only from that VPC.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.