- A
Create a customer-managed KMS key and specify it in the CodeBuild project's artifacts encryption settings.
Why wrong: CodeBuild does not have direct artifact encryption settings; it uses S3 bucket encryption.
- B
Use an S3 bucket policy to deny write operations unless the request includes the x-amz-server-side-encryption header.
Why wrong: This works but is more complex than default encryption.
- C
Enable default encryption on the S3 bucket used for CodeBuild artifacts.
Default encryption enforces SSE-S3 or SSE-KMS on all objects.
- D
Configure the CodeBuild project to use an encrypted EBS volume for the build environment.
Why wrong: EBS encryption encrypts the build environment, not the artifacts.
Question 1,658 of 1,750
How to Encrypt Build Artifacts in AWS CodeBuild
This DOP-C02 practice question tests your understanding of security and compliance. 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 uses AWS CodeBuild to build and test code. The security team requires that all build artifacts be encrypted at rest. Which action should the DevOps engineer take to meet this requirement?
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 default encryption on the S3 bucket used for CodeBuild artifacts.
To ensure all build artifacts are encrypted at rest, the simplest and most direct approach is to enable default encryption on the S3 bucket used for CodeBuild artifacts. This ensures that any object uploaded to the bucket is automatically encrypted with Amazon S3-managed keys (SSE-S3) or AWS KMS keys. Option A is incorrect because CodeBuild does not have a setting to specify a KMS key for artifact encryption at the project level; encryption is handled by the S3 bucket. Option B is incorrect because while an S3 bucket policy can enforce encryption headers, it is more complex and not necessary if default encryption is enabled. Option D is incorrect because the build environment's EBS volume encryption does not affect the artifacts stored in S3.
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.
- ✗
Create a customer-managed KMS key and specify it in the CodeBuild project's artifacts encryption settings.
Why it's wrong here
CodeBuild does not have direct artifact encryption settings; it uses S3 bucket encryption.
- ✗
Use an S3 bucket policy to deny write operations unless the request includes the x-amz-server-side-encryption header.
Why it's wrong here
This works but is more complex than default encryption.
- ✓
Enable default encryption on the S3 bucket used for CodeBuild artifacts.
Why this is correct
Default encryption enforces SSE-S3 or SSE-KMS on all objects.
Related concept
Standard ACLs match source addresses.
- ✗
Configure the CodeBuild project to use an encrypted EBS volume for the build environment.
Why it's wrong here
EBS encryption encrypts the build environment, not the artifacts.
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 DOP-C02 ACL questions on filtering logic and placement.
- →
Security and Compliance — study guide chapter
Learn the concepts, then practise the questions
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Security and Compliance practice questions
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable default encryption on the S3 bucket used for CodeBuild artifacts. — To ensure all build artifacts are encrypted at rest, the simplest and most direct approach is to enable default encryption on the S3 bucket used for CodeBuild artifacts. This ensures that any object uploaded to the bucket is automatically encrypted with Amazon S3-managed keys (SSE-S3) or AWS KMS keys. Option A is incorrect because CodeBuild does not have a setting to specify a KMS key for artifact encryption at the project level; encryption is handled by the S3 bucket. Option B is incorrect because while an S3 bucket policy can enforce encryption headers, it is more complex and not necessary if default encryption is enabled. Option D is incorrect because the build environment's EBS volume encryption does not affect the artifacts stored in S3.
What should I do if I get this DOP-C02 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 DOP-C02 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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