DEA-C01 Data Security and Governance Practice Question
A company wants to enforce that all data in Amazon S3 is encrypted at rest. They want to automatically reject any PUT request that does not include encryption headers. What S3 feature 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
✓
Bucket policy with a condition for encryption headers
S3 bucket policies can include a condition that denies PutObject requests if they do not include the required encryption headers (e.g., x-amz-server-side-encryption). This enforces encryption at rest by rejecting unencrypted uploads. Default encryption only automatically encrypts objects that are uploaded without encryption headers, but does not reject them. MFA Delete is for requiring multi-factor authentication for delete operations, not for encryption. S3 Block Public Access controls public access to buckets, not encryption. Therefore, option A is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Bucket policy with a condition for encryption headers
Why this is correct
A bucket policy can deny requests that lack the required encryption header, enforcing encryption.
- ✗
Default encryption
Why it's wrong here
Default encryption applies server-side encryption to objects without encryption headers, but it does not reject the request.
- ✗
MFA Delete
Why it's wrong here
MFA Delete protects against accidental deletion, not encryption.
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S3 Block Public Access
Why it's wrong here
Block Public Access prevents public access, not unencrypted uploads.
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
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.