DEA-C01 Data Security and Governance Practice Question
A company uses AWS KMS to encrypt data in Amazon S3. The security team wants to ensure that the KMS key can only be used from within the company's VPC. Which policy element should be added to the KMS key policy?
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
✓
Add a condition using aws:SourceVpc to allow only requests from the VPC.
Using a condition with aws:SourceVpc restricts key usage to requests originating from a specific VPC. Option A is wrong because the Principal element specifies who can use the key, not where. Option B is wrong because aws:SourceIp is for IP addresses, not VPC. Option D is wrong because kms:ViaService restricts usage to specific AWS services, not network location.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set the Principal element to restrict access to the VPC.
Why it's wrong here
Principal identifies the entity, not the network.
- ✗
Add a condition using aws:SourceIp to allow only IP addresses from the VPC.
Why it's wrong here
aws:SourceIp works with IP addresses, not VPC IDs.
- ✓
Add a condition using aws:SourceVpc to allow only requests from the VPC.
Why this is correct
This condition restricts key usage to the specified VPC.
- ✗
Add a condition using kms:ViaService to allow only via VPC endpoints.
Why it's wrong here
kms:ViaService restricts to specific AWS services.
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.