ANS-C01 Network Security, Compliance and Governance Practice Question
A company wants to encrypt data at rest in an S3 bucket. Which AWS service can manage the encryption keys if the company wants to use server-side encryption with AWS KMS?
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
✓
AWS Key Management Service (KMS)
AWS Key Management Service (KMS) is the service that manages encryption keys for server-side encryption (SSE-KMS). Option D is correct. AWS Certificate Manager (ACM) manages SSL/TLS certificates. AWS CloudHSM provides dedicated hardware security modules but is not required for SSE-KMS. AWS Secrets Manager manages secrets like database credentials.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Certificate Manager (ACM)
Why it's wrong here
ACM manages SSL/TLS certificates, not encryption keys for S3.
- ✗
AWS CloudHSM
Why it's wrong here
CloudHSM provides dedicated hardware security modules but is not the default service for S3 encryption key management.
- ✗
AWS Secrets Manager
Why it's wrong here
Secrets Manager manages secrets like database passwords, not encryption keys for S3.
- ✓
AWS Key Management Service (KMS)
Why this is correct
KMS creates and manages encryption keys used for server-side encryption in S3.
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.