- A
Enable S3 Block Public Access to block public access to the bucket.
Why wrong: S3 Block Public Access controls public access, not encryption.
- B
Enable default encryption on the S3 bucket using S3-Managed Keys (SSE-S3).
Why wrong: Default encryption applies only when no encryption header is specified; it does not enforce encryption for requests that explicitly set encryption to 'None'.
- C
Enable S3 Object Lock on the bucket.
Why wrong: S3 Object Lock prevents object deletion or overwrite but does not enforce encryption.
- D
Configure an S3 bucket policy that denies PutObject requests without the x-amz-server-side-encryption header.
A bucket policy can conditionally deny uploads that lack the required encryption header, enforcing encryption for all new objects.
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 data engineer needs to ensure that all data in an S3 bucket is encrypted at rest. The bucket contains objects uploaded by various applications. What is the simplest method to enforce encryption for all new objects?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure 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 enforce encryption by denying PutObject requests that do not include the x-amz-server-side-encryption header. Option A is wrong because default encryption applies only if the upload request does not specify encryption headers; it does not enforce encryption for requests that specify 'None'. Option C is wrong because enabling S3 Block Public Access does not enforce encryption. Option D is wrong because S3 Object Lock prevents deletion 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 S3 Block Public Access to block public access to the bucket.
Why it's wrong here
S3 Block Public Access controls public access, not encryption.
- ✗
Enable default encryption on the S3 bucket using S3-Managed Keys (SSE-S3).
Why it's wrong here
Default encryption applies only when no encryption header is specified; it does not enforce encryption for requests that explicitly set encryption to 'None'.
- ✗
Enable S3 Object Lock on the bucket.
Why it's wrong here
S3 Object Lock prevents object deletion or overwrite but does not enforce encryption.
- ✓
Configure an S3 bucket policy that denies PutObject requests without the x-amz-server-side-encryption header.
Why this is correct
A bucket policy can conditionally deny uploads that lack the required encryption header, enforcing encryption for all new objects.
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.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
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: Configure 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 enforce encryption by denying PutObject requests that do not include the x-amz-server-side-encryption header. Option A is wrong because default encryption applies only if the upload request does not specify encryption headers; it does not enforce encryption for requests that specify 'None'. Option C is wrong because enabling S3 Block Public Access does not enforce encryption. Option D is wrong because S3 Object Lock prevents deletion but does not enforce encryption.
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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Last reviewed: Jun 20, 2026
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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