ANS-C01 Network Security, Compliance and Governance Practice Question
Which TWO of the following are valid methods to secure data at rest in Amazon S3? (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
✓
Use SSE-S3 (Server-Side Encryption with S3 managed keys).
Options A and C are correct. SSE-S3 (Server-Side Encryption with S3 managed keys) encrypts data at rest on S3. Client-side encryption, where the customer encrypts data before uploading, also protects data at rest. Option B (SSL/TLS) encrypts data in transit, not at rest. Option D (VPC endpoint) restricts network access but does not encrypt. Option E (network ACL) controls traffic but does not encrypt data.
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 SSE-S3 (Server-Side Encryption with S3 managed keys).
Why this is correct
Correct. SSE-S3 is a server-side encryption option that protects data at rest using S3-managed keys.
- ✗
Use SSL/TLS to encrypt data during transfer.
Why it's wrong here
Incorrect. SSL/TLS encrypts data in transit between client and S3, not data at rest in S3.
- ✓
Use client-side encryption before uploading objects.
Why this is correct
Correct. Client-side encryption encrypts data before it is uploaded, ensuring data is encrypted at rest.
- ✗
Use a VPC endpoint to restrict access to the bucket.
Why it's wrong here
Incorrect. VPC endpoints restrict network access to the S3 bucket but do not encrypt data at rest.
- ✗
Configure a network ACL to block unauthorized access.
Why it's wrong here
Incorrect. Network ACLs filter network traffic but do not provide encryption for data at rest.
Visual reference
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.