DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security 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 enforce that all data in Amazon S3 is encrypted at rest. They want to automatically reject any PUT request that does not include encryption headers. What S3 feature should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Bucket policy with a condition for encryption headers
S3 bucket policies can be used to deny requests that do not include the x-amz-server-side-encryption header. This enforces encryption. Option A is wrong because default encryption only encrypts objects that are uploaded without encryption headers, but it does not reject unencrypted requests. Option B is wrong because S3 Block Public Access is about public access, not encryption. Option D is wrong because MFA Delete is about deletion protection.
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.
✓
Bucket policy with a condition for encryption headers
Why this is correct
A bucket policy can deny requests that lack the required encryption header, enforcing encryption.
Related concept
Standard ACLs match source addresses.
✗
Default encryption
Why it's wrong here
Default encryption applies server-side encryption to objects without encryption headers, but it does not reject the request.
✗
MFA Delete
Why it's wrong here
MFA Delete protects against accidental deletion, not encryption.
✗
S3 Block Public Access
Why it's wrong here
Block Public Access prevents public access, not unencrypted uploads.
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 Security and Governance — This question tests Data Security and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Bucket policy with a condition for encryption headers — S3 bucket policies can be used to deny requests that do not include the x-amz-server-side-encryption header. This enforces encryption. Option A is wrong because default encryption only encrypts objects that are uploaded without encryption headers, but it does not reject unencrypted requests. Option B is wrong because S3 Block Public Access is about public access, not encryption. Option D is wrong because MFA Delete is about deletion protection.
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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