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 has an S3 bucket with sensitive data. The security team requires that all data uploaded to the bucket be automatically encrypted at rest using server-side encryption with AWS KMS managed keys (SSE-KMS). How can this be enforced?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an S3 bucket policy that denies PutObject requests without the x-amz-server-side-encryption header.
Option B is correct because S3 bucket policies can deny uploads that do not include the x-amz-server-side-encryption header. Option A is wrong because default encryption applies to objects without encryption headers, but doesn't enforce encryption. Option C is wrong because IAM policies can require encryption but bucket policies are more direct. Option D is wrong because CloudTrail logs actions but does not enforce encryption.
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 default encryption on the S3 bucket with SSE-KMS.
Why it's wrong here
Default encryption does not require users to specify encryption headers.
✓
Use an S3 bucket policy that denies PutObject requests without the x-amz-server-side-encryption header.
Why this is correct
Bucket policy can enforce encryption headers.
Related concept
Standard ACLs match source addresses.
✗
Enable AWS CloudTrail to monitor uploads and alert on unencrypted objects.
Why it's wrong here
CloudTrail is for logging, not enforcement.
✗
Create an IAM policy that requires all S3 operations to use SSE-KMS.
Why it's wrong here
IAM policy cannot enforce encryption headers for all users.
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: Use an S3 bucket policy that denies PutObject requests without the x-amz-server-side-encryption header. — Option B is correct because S3 bucket policies can deny uploads that do not include the x-amz-server-side-encryption header. Option A is wrong because default encryption applies to objects without encryption headers, but doesn't enforce encryption. Option C is wrong because IAM policies can require encryption but bucket policies are more direct. Option D is wrong because CloudTrail logs actions but does not enforce encryption.
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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