- A
Enable server-side encryption (SSE-S3) on the bucket.
SSE-S3 encrypts objects at rest.
- B
Use an S3 VPC endpoint.
Why wrong: This provides private connectivity, not encryption.
- C
Set a bucket policy that denies uploads without encryption.
Enforces encryption at upload time.
- D
Use client-side encryption with AWS KMS.
Why wrong: Client-side encryption is performed by the client, not managed by S3.
- E
Enable S3 Transfer Acceleration.
Why wrong: This improves upload speed, not encryption.
Question 109 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company wants to secure data at rest in an Amazon S3 bucket. Which TWO of the following can be used 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 server-side encryption (SSE-S3) on the bucket.
Server-side encryption (SSE-S3) and bucket policies that deny uploads without encryption both enforce encryption of data at rest in S3. Option A enables SSE-S3, which encrypts data automatically. Option C uses a bucket policy to require encryption on uploads, ensuring data is encrypted at rest. Option B (VPC endpoint) provides private connectivity but does not encrypt data at rest. Option D (client-side encryption) is a valid encryption method, but it is not managed by S3 and is not one of the two selected answers. Option E (Transfer Acceleration) improves transfer speed, not security.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable server-side encryption (SSE-S3) on the bucket.
Why this is correct
SSE-S3 encrypts objects at rest.
Related concept
Standard ACLs match source addresses.
- ✗
Use an S3 VPC endpoint.
Why it's wrong here
This provides private connectivity, not encryption.
- ✓
Set a bucket policy that denies uploads without encryption.
Why this is correct
Enforces encryption at upload time.
Related concept
Standard ACLs match source addresses.
- ✗
Use client-side encryption with AWS KMS.
Why it's wrong here
Client-side encryption is performed by the client, not managed by S3.
- ✗
Enable S3 Transfer Acceleration.
Why it's wrong here
This improves upload speed, not encryption.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable server-side encryption (SSE-S3) on the bucket. — Server-side encryption (SSE-S3) and bucket policies that deny uploads without encryption both enforce encryption of data at rest in S3. Option A enables SSE-S3, which encrypts data automatically. Option C uses a bucket policy to require encryption on uploads, ensuring data is encrypted at rest. Option B (VPC endpoint) provides private connectivity but does not encrypt data at rest. Option D (client-side encryption) is a valid encryption method, but it is not managed by S3 and is not one of the two selected answers. Option E (Transfer Acceleration) improves transfer speed, not security.
What should I do if I get this ANS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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