DEA-C01 Data Operations and Support Practice Question
A company stores sensitive data in Amazon S3 and requires that all data be encrypted at rest. The data is accessed by multiple AWS services. Which solution meets the encryption requirement with the LEAST operational overhead?
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 S3 default encryption with SSE-S3
Enabling S3 default encryption with SSE-S3 provides server-side encryption automatically without any key management overhead. Option A is wrong because SSE-KMS requires managing KMS keys. Option B is wrong because client-side encryption requires managing keys on the client side. Option C is wrong because SSE-C requires managing your own keys.
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 server-side encryption with AWS KMS (SSE-KMS)
Why it's wrong here
Requires managing KMS keys.
- ✗
Use client-side encryption with AWS KMS
Why it's wrong here
Client-side encryption adds complexity.
- ✗
Use server-side encryption with customer-provided keys (SSE-C)
Why it's wrong here
Requires managing your own keys.
- ✓
Enable S3 default encryption with SSE-S3
Why this is correct
Least overhead as AWS manages the keys.
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.