This DEA-C01 practice question tests your understanding of data store management. 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 Amazon S3 to store sensitive data. The security team wants to ensure that all objects uploaded to a specific S3 bucket are automatically encrypted at rest using server-side encryption with AWS KMS managed keys (SSE-KMS). Which bucket policy statement should be added to enforce this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deny put requests where 's3:x-amz-server-side-encryption' is not 'aws:kms'
Option C is correct because the condition 's3:x-amz-server-side-encryption': 'aws:kms' enforces SSE-KMS. Option A denies requests with SSE-S3 but allows unencrypted uploads. Option B denies without encryption but allows SSE-S3. Option D denies SSE-KMS, which is the opposite of what is needed.
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.
✗
Deny put requests where 's3:x-amz-server-side-encryption' is 'aws:kms'
Why it's wrong here
This would prevent SSE-KMS, the opposite of what is required.
✓
Deny put requests where 's3:x-amz-server-side-encryption' is not 'aws:kms'
Why this is correct
This enforces SSE-KMS encryption.
Related concept
Standard ACLs match source addresses.
✗
Deny put requests where 's3:x-amz-server-side-encryption' is not 'AES256'
Why it's wrong here
This enforces SSE-S3, not SSE-KMS.
✗
Deny put requests where 's3:x-amz-server-side-encryption' is not set
Why it's wrong here
This denies unencrypted uploads but still allows SSE-S3.
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 DEA-C01 ACL questions on filtering logic and placement.
Data Store Management — This question tests Data Store Management — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Deny put requests where 's3:x-amz-server-side-encryption' is not 'aws:kms' — Option C is correct because the condition 's3:x-amz-server-side-encryption': 'aws:kms' enforces SSE-KMS. Option A denies requests with SSE-S3 but allows unencrypted uploads. Option B denies without encryption but allows SSE-S3. Option D denies SSE-KMS, which is the opposite of what is needed.
What should I do if I get this DEA-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 DEA-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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Question Discussion
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