Quick Answer
The answer is to enable default encryption on the S3 bucket with SSE-S3. This is the minimal effort solution because SSE-S3 uses Amazon’s own key management infrastructure to automatically encrypt every new object written to the bucket, requiring no additional code, key rotation, or manual intervention. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of balancing security requirements with operational overhead—bucket policies can enforce encryption but demand more effort to write and maintain, making default encryption the simpler choice. A common trap is assuming a bucket policy is always required, but default encryption handles the core requirement automatically. Memory tip: think “Set it and forget it” for SSE-S3 default encryption.
This DEA-C01 practice question tests your understanding of data store management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 stores sensitive data in Amazon S3. They need to ensure that all objects are encrypted at rest. Which approach meets this requirement with minimal effort?
Use client-side encryption before uploading
Why wrong: Requires application changes and key management.
Enable default encryption on the S3 bucket with SSE-S3
Automatically encrypts all new objects with minimal effort.
Enable S3 Versioning and MFA Delete
Why wrong: Does not provide encryption.
Use a bucket policy to deny PutObject without encryption
Why wrong: Requires careful policy management and may be bypassed.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable default encryption on the S3 bucket with SSE-S3
Enabling S3 default encryption (SSE-S3) ensures all new objects are encrypted automatically. Bucket policies can enforce encryption but require more effort.
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.
Use client-side encryption before uploading
Why it's wrong here
Requires application changes and key management.
Enable default encryption on the S3 bucket with SSE-S3
Why this is correct
Automatically encrypts all new objects with minimal effort.
Related concept
Standard ACLs match source addresses.
Enable S3 Versioning and MFA Delete
Why it's wrong here
Does not provide encryption.
Use a bucket policy to deny PutObject without encryption
Why it's wrong here
Requires careful policy management and may be bypassed.
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.
Data Store Management — study guide chapter
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FAQ
Data Store Management — This question tests Data Store Management — Standard ACLs match source addresses..
The correct answer is: Enable default encryption on the S3 bucket with SSE-S3 — Enabling S3 default encryption (SSE-S3) ensures all new objects are encrypted automatically. Bucket policies can enforce encryption but require more effort.
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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