DEA-C01 Data Operations and Support Practice Question
A company stores sensitive customer data in an S3 bucket. The data engineer needs to ensure that all data is encrypted at rest. Which S3 feature should be enabled?
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 ensures that all new objects written to the bucket are encrypted at rest using SSE-S3, SSE-KMS, or SSE-C. Option A is incorrect because S3 Versioning tracks object versions but does not encrypt data. Option B is incorrect because S3 Block Public Access controls public access, not encryption. Option C is incorrect because the aws:SecureTransport condition enforces encryption in transit, not at rest.
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 Versioning
Why it's wrong here
Versioning preserves object versions, does not encrypt.
- ✗
S3 Block Public Access
Why it's wrong here
This prevents public access, not encryption.
- ✗
Bucket policy requiring aws:SecureTransport
Why it's wrong here
This enforces HTTPS, not encryption at rest.
- ✓
Default encryption
Why this is correct
Default encryption automatically encrypts new objects.
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.