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 needs to enforce encryption at rest for all data stored in Amazon S3. The security team wants to ensure that no objects can be uploaded without encryption. Which THREE steps should be taken 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
✓
Use AWS Key Management Service (KMS) to manage encryption keys
A bucket policy denying s3:PutObject without the x-amz-server-side-encryption header enforces encryption. Using SSE-S3 or SSE-KMS ensures encryption at rest. SSE-C is not recommended for most cases. Requiring HTTPS ensures encryption in transit, not at rest. CloudTrail is for auditing.
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.
✗
Require all clients to use AWS CloudTrail for logging
Why it's wrong here
CloudTrail logs API calls but does not enforce encryption.
✗
Enable Amazon S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration speeds up uploads but does not enforce encryption.
✓
Use AWS Key Management Service (KMS) to manage encryption keys
Why this is correct
SSE-KMS is a valid option for encryption at rest, and enforcing its use can be part of the policy.
Related concept
Standard ACLs match source addresses.
✓
Create an S3 bucket policy that denies s3:PutObject if the x-amz-server-side-encryption header is not present
Why this is correct
This enforces that all uploads must have the encryption header.
Related concept
Standard ACLs match source addresses.
✓
Enable default encryption on the S3 bucket using SSE-S3
Why this is correct
Default encryption ensures objects without encryption headers are encrypted automatically.
Related concept
Standard ACLs match source addresses.
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: Use AWS Key Management Service (KMS) to manage encryption keys — A bucket policy denying s3:PutObject without the x-amz-server-side-encryption header enforces encryption. Using SSE-S3 or SSE-KMS ensures encryption at rest. SSE-C is not recommended for most cases. Requiring HTTPS ensures encryption in transit, not at rest. CloudTrail is for auditing.
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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