DEA-C01 Data Security and Governance Practice Question
A company needs to enforce encryption at rest for all data stored in Amazon S3. The security team wants to ensure that no objects can be uploaded without encryption. Which THREE steps should be taken to meet this requirement?
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 AWS Key Management Service (KMS) to manage encryption keys
A bucket policy denying s3:PutObject without the x-amz-server-side-encryption header enforces encryption. Using SSE-S3 or SSE-KMS ensures encryption at rest. SSE-C is not recommended for most cases. Requiring HTTPS ensures encryption in transit, not at rest. CloudTrail is for auditing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Require all clients to use AWS CloudTrail for logging
Why it's wrong here
CloudTrail logs API calls but does not enforce encryption.
- ✗
Enable Amazon S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration speeds up uploads but does not enforce encryption.
- ✓
Use AWS Key Management Service (KMS) to manage encryption keys
Why this is correct
SSE-KMS is a valid option for encryption at rest, and enforcing its use can be part of the policy.
- ✓
Create an S3 bucket policy that denies s3:PutObject if the x-amz-server-side-encryption header is not present
Why this is correct
This enforces that all uploads must have the encryption header.
- ✓
Enable default encryption on the S3 bucket using SSE-S3
Why this is correct
Default encryption ensures objects without encryption headers are encrypted automatically.
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.