The answer is SSE-S3 and SSE-KMS, as both are server-side encryption methods that encrypt S3 objects at rest. SSE-S3 uses Amazon-managed keys with strong AES-256 encryption, while SSE-KMS gives you control over key management and audit trails via AWS KMS. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of the distinction between server-side and client-side encryption, and the common trap is confusing bucket policies that *require* encryption with the actual encryption mechanism itself—policies enforce, they don’t encrypt. Remember that S3 handles all server-side encryption transparently upon write, so enabling default encryption on the bucket with either SSE-S3 or SSE-KMS ensures every new object is automatically encrypted at rest. For a quick memory tip: think “S3 server-side = S3 or KMS, client-side = you.”
DEA-C01 Data Store Management Practice Question
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 is using Amazon S3 to store sensitive financial data. They need to ensure that all objects are encrypted at rest. Which TWO methods can achieve this? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use SSE-KMS to encrypt objects with AWS KMS.
Options A and B are correct. SSE-S3 and SSE-KMS both provide encryption at rest. Option C is wrong because client-side encryption is not managed by S3. Option D is wrong because bucket policies do not enforce encryption; they require encryption. Option E is wrong because S3 Transfer Acceleration is for speed, not encryption.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 Transfer Acceleration on the bucket.
Why it's wrong here
Transfer Acceleration improves upload speed, not encryption.
✗
Apply a bucket policy that denies PutObject without encryption.
Why it's wrong here
This policy enforces encryption but does not actually encrypt objects; objects could still be uploaded with SSE-C.
✓
Use SSE-KMS to encrypt objects with AWS KMS.
Why this is correct
SSE-KMS provides server-side encryption with customer-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use client-side encryption before uploading objects.
Why it's wrong here
Client-side encryption is performed by the client, not S3; it does not ensure at-rest encryption within S3.
✓
Enable default encryption on the S3 bucket using SSE-S3.
Why this is correct
SSE-S3 provides server-side encryption with Amazon S3-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use SSE-KMS to encrypt objects with AWS KMS. — Options A and B are correct. SSE-S3 and SSE-KMS both provide encryption at rest. Option C is wrong because client-side encryption is not managed by S3. Option D is wrong because bucket policies do not enforce encryption; they require encryption. Option E is wrong because S3 Transfer Acceleration is for speed, not encryption.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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