The answer is to set default encryption on the bucket to use SSE-KMS with the customer-managed key. This ensures that any object uploaded without an explicit encryption header is automatically encrypted using the specified AWS KMS key, because S3 default encryption acts as a bucket-level policy that applies server-side encryption to all new objects. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of the difference between enforcing encryption (via bucket policies) and automatically applying it (via default encryption). A common trap is confusing a bucket policy that denies unencrypted uploads—which only rejects non-compliant requests—with default encryption, which silently encrypts them. Remember: default encryption is a safety net, not a gatekeeper. Memory tip: think “Default = Automatic, Policy = Enforced.”
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 uses Amazon S3 to store customer documents. The data engineer needs to ensure that all objects uploaded to a specific S3 bucket are automatically encrypted with a customer-managed AWS KMS key. What should the data engineer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set default encryption on the bucket to use SSE-KMS with the customer-managed key.
Setting a default encryption policy on the bucket with SSE-KMS ensures all objects are encrypted with the specified KMS key. Option A is wrong because bucket policies can enforce encryption but don't automatically encrypt. Option B is wrong because enabling S3 Versioning doesn't enforce encryption. Option D is wrong because pre-signed URLs don't enforce 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.
✗
Use pre-signed URLs for all uploads that include encryption parameters.
Why it's wrong here
Pre-signed URLs require client-side action, not automatic.
✗
Create a bucket policy that denies uploads without encryption.
Why it's wrong here
This enforces encryption but does not automatically encrypt objects.
✗
Enable S3 Versioning on the bucket.
Why it's wrong here
Versioning does not enforce encryption.
✓
Set default encryption on the bucket to use SSE-KMS with the customer-managed key.
Why this is correct
Default encryption automatically encrypts all objects with the specified KMS key.
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: Set default encryption on the bucket to use SSE-KMS with the customer-managed key. — Setting a default encryption policy on the bucket with SSE-KMS ensures all objects are encrypted with the specified KMS key. Option A is wrong because bucket policies can enforce encryption but don't automatically encrypt. Option B is wrong because enabling S3 Versioning doesn't enforce encryption. Option D is wrong because pre-signed URLs don't enforce 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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Question Discussion
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