DEA-C01 Data Security and Governance Practice Question
A company needs to enforce that all objects uploaded to an S3 bucket are encrypted at rest. Which bucket setting 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
✓
Default encryption
Default encryption, is the correct bucket setting because it ensures all objects uploaded to the bucket are automatically encrypted at rest using SSE-S3 or SSE-KMS. Option B is incorrect because S3 Object Lock is used for compliance and retention, not encryption. Option C is incorrect because while a bucket policy can enforce encryption via the s3:x-amz-server-side-encryption header, the question asks for a bucket setting, and default encryption is the simpler and direct setting. Option D is incorrect because S3 Block Public Access controls public access, not encryption.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Default encryption
Why this is correct
Default encryption automatically encrypts objects at rest.
- ✗
S3 Object Lock
Why it's wrong here
Object Lock prevents object deletion, not encryption.
- ✗
Bucket policy requiring s3:x-amz-server-side-encryption header
Why it's wrong here
While this can enforce encryption, default encryption is the recommended approach.
- ✗
S3 Block Public Access
Why it's wrong here
Block Public Access prevents public access, not encryption.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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