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 data engineer is setting up Amazon S3 bucket policies for a data lake. The security team requires that all objects uploaded to the bucket be encrypted at rest using server-side encryption. Which TWO methods can enforce encryption at upload time?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 default encryption on the bucket.
Option D is correct because enabling S3 default encryption on the bucket automatically applies server-side encryption (SSE-S3 or SSE-KMS) to all objects uploaded without an encryption header, ensuring encryption at rest. Option E is correct because a bucket policy with a Deny effect on PutObject when the x-amz-server-side-encryption header is missing enforces encryption at upload time by rejecting unencrypted uploads, providing a complementary enforcement mechanism.
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.
Why it's wrong here
Transfer Acceleration does not enforce encryption.
Read the scenario before looking for a memorised answer.
✓
Create a bucket policy that denies PutObject if the x-amz-server-side-encryption header is missing.
Why this is correct
Denies uploads without encryption header.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse default encryption (which applies encryption automatically but does not block unencrypted uploads) with a bucket policy that explicitly denies unencrypted uploads, thinking either alone is sufficient, when both are needed for full enforcement.
Detailed technical explanation
How to think about this question
Default encryption on an S3 bucket uses a bucket-level setting that applies SSE-S3 (AES-256) or SSE-KMS to objects when no encryption header is present, but it does not prevent unencrypted uploads if the client explicitly sets the header to 'None'. A bucket policy with a conditional Deny on the absence of the x-amz-server-side-encryption header (or requiring a specific value like 'AES256' or 'aws:kms') provides a stronger enforcement by rejecting any PutObject request that does not include the required encryption header, ensuring compliance even if default encryption is bypassed.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Enable S3 default encryption on the bucket. — Option D is correct because enabling S3 default encryption on the bucket automatically applies server-side encryption (SSE-S3 or SSE-KMS) to all objects uploaded without an encryption header, ensuring encryption at rest. Option E is correct because a bucket policy with a Deny effect on PutObject when the x-amz-server-side-encryption header is missing enforces encryption at upload time by rejecting unencrypted uploads, providing a complementary enforcement mechanism.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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