- A
Use pre-signed URLs for all uploads that include encryption parameters.
Why wrong: Pre-signed URLs require client-side action, not automatic.
- B
Create a bucket policy that denies uploads without encryption.
Why wrong: This enforces encryption but does not automatically encrypt objects.
- C
Enable S3 Versioning on the bucket.
Why wrong: Versioning does not enforce encryption.
- D
Set default encryption on the bucket to use SSE-KMS with the customer-managed key.
Default encryption automatically encrypts all objects with the specified KMS key.
Question 496 of 1,786
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 choices
Why each option matters
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.
Option D is correct because setting default encryption on the S3 bucket to SSE-KMS with the customer-managed key ensures that all objects uploaded without explicit encryption headers are automatically encrypted using that KMS key. This satisfies the requirement without relying on client-side behavior, as S3 applies the encryption server-side at the time of write.
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
The trap here is that candidates often confuse bucket policies that deny unencrypted uploads (which only reject non-compliant requests) with default encryption (which automatically encrypts objects), leading them to choose Option B instead of D.
Detailed technical explanation
How to think about this question
Under the hood, S3 default encryption works by intercepting PUT requests that lack an x-amz-server-side-encryption header and applying the configured SSE-KMS encryption before writing the object. The customer-managed KMS key must be in the same AWS region as the bucket, and the bucket policy must grant the s3:PutObject permission with the kms:GenerateDataKey action for the key. A real-world scenario is compliance with regulations like HIPAA, where automatic encryption ensures all data at rest is encrypted without relying on application developers to remember encryption headers.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
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. — Option D is correct because setting default encryption on the S3 bucket to SSE-KMS with the customer-managed key ensures that all objects uploaded without explicit encryption headers are automatically encrypted using that KMS key. This satisfies the requirement without relying on client-side behavior, as S3 applies the encryption server-side at the time of write.
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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Last reviewed: Jul 4, 2026
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