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 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.
Option A is correct because CodeBuild stores artifacts in an S3 bucket; enabling default encryption on that bucket ensures all objects are encrypted. Option B is wrong because CodeBuild artifacts are stored in S3, not EBS. Option C is wrong because the artifact bucket is managed by the customer. Option D is wrong although it could work, but enabling default encryption on the bucket is simpler and more direct.
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.
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 — 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. — Option A is correct because CodeBuild stores artifacts in an S3 bucket; enabling default encryption on that bucket ensures all objects are encrypted. Option B is wrong because CodeBuild artifacts are stored in S3, not EBS. Option C is wrong because the artifact bucket is managed by the customer. Option D is wrong although it could work, but enabling default encryption on the bucket is simpler and more direct.
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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Question Discussion
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