DEA-C01 Data Security and Governance Practice Question
A company needs to enforce encryption at rest for all data stored in Amazon S3. Which of the following are valid methods to achieve this? (Choose TWO.)
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
✓
Enable default bucket encryption using SSE-S3.
Server-side encryption with S3 managed keys (SSE-S3) encrypts data at rest on the server side. Client-side encryption encrypts data before uploading, ensuring it is encrypted at rest from the client's perspective. Options A and E are for encryption in transit, and C is versioning, not encryption. Correct: B and D.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Amazon S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration speeds up transfers but does not encrypt data at rest.
- ✓
Enable default bucket encryption using SSE-S3.
Why this is correct
Default bucket encryption ensures all objects are encrypted at rest with SSE-S3.
- ✗
Enable S3 Versioning.
Why it's wrong here
Versioning is for object version management, not encryption.
- ✓
Use client-side encryption before uploading objects.
Why this is correct
Client-side encryption encrypts data before upload, resulting in encryption at rest.
- ✗
Use SSL/TLS for all S3 API calls.
Why it's wrong here
SSL/TLS encrypts data in transit, not at rest.
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.