ANS-C01 Network Security, Compliance and Governance Practice Question
Which TWO encryption methods for data at rest in Amazon S3 use AWS-managed or customer-managed keys? (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
✓
SSE-S3
SSE-S3 uses AWS-managed keys, and SSE-KMS uses customer-managed keys via AWS KMS. Both are valid methods to encrypt data at rest in Amazon S3. SSE-C uses customer-provided keys, which is not a managed key service. Client-side encryption is performed by the client before upload and does not use AWS-managed or customer-managed keys. SSL/TLS encrypts data 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.
- ✗
SSE-C
Why it's wrong here
SSE-C uses customer-provided keys, not managed keys.
- ✗
Client-Side Encryption
Why it's wrong here
Client-side encryption is performed by the client, not using AWS-managed or customer-managed keys.
- ✗
SSL/TLS
Why it's wrong here
SSL/TLS encrypts data in transit, not at rest.
- ✓
SSE-S3
Why this is correct
SSE-S3 uses AWS-managed keys to encrypt data at rest.
- ✓
SSE-KMS
Why this is correct
SSE-KMS uses customer-managed keys via AWS KMS to encrypt data 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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-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 ANS-C01 exam.