DEA-C01 Data Security and Governance Practice Question
A data engineer needs to ensure that data in an S3 bucket is encrypted at rest. The bucket policy includes a condition that denies PutObject requests if the object is not encrypted. Which S3 encryption feature does this enforce?
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
✓
S3 Bucket Policy
S3 bucket policies can require server-side encryption by denying PutObject without encryption headers. Option C (default encryption) is a bucket-level setting that automatically encrypts objects, but it does not enforce encryption via policy. Option A (object lock) prevents deletion. Option B (MFA delete) requires multi-factor authentication.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
S3 Object Lock
Why it's wrong here
Object lock prevents deletion, not encryption enforcement.
- ✗
S3 MFA Delete
Why it's wrong here
MFA delete requires additional authentication, not encryption.
- ✗
S3 Default Encryption
Why it's wrong here
Default encryption automatically encrypts, but does not enforce via policy.
- ✓
S3 Bucket Policy
Why this is correct
Bucket policy can deny uploads if encryption is not set.
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.