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 data in an S3 bucket is encrypted at rest. The bucket policy includes a condition that denies PutObject requests if the object is not encrypted. Which S3 encryption feature does this enforce?
S3 Object Lock
Why wrong: Object lock prevents deletion, not encryption enforcement.
S3 MFA Delete
Why wrong: MFA delete requires additional authentication, not encryption.
S3 Default Encryption
Why wrong: Default encryption automatically encrypts, but does not enforce via policy.
S3 Bucket Policy
Bucket policy can deny uploads if encryption is not set.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
S3 Bucket Policy
Option D is correct because S3 bucket policies can require server-side encryption by denying PutObject without encryption headers. Option A (default encryption) is a bucket-level setting that automatically encrypts objects, but it does not enforce encryption via policy. Option B (object lock) prevents deletion. Option C (MFA delete) requires multi-factor authentication.
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
For each option: why learners choose it and why it is or isn't the right answer here.
S3 Object Lock
Why it's wrong here
Object lock prevents deletion, not encryption enforcement.
S3 MFA Delete
Why it's wrong here
MFA delete requires additional authentication, not encryption.
S3 Default Encryption
Why it's wrong here
Default encryption automatically encrypts, but does not enforce via policy.
S3 Bucket Policy
Why this is correct
Bucket policy can deny uploads if encryption is not set.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
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.
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
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
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
Data Security and Governance — This question tests Data Security and Governance — Standard ACLs match source addresses..
The correct answer is: S3 Bucket Policy — Option D is correct because S3 bucket policies can require server-side encryption by denying PutObject without encryption headers. Option A (default encryption) is a bucket-level setting that automatically encrypts objects, but it does not enforce encryption via policy. Option B (object lock) prevents deletion. Option C (MFA delete) requires multi-factor authentication.
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.
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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