- A
Enable S3 Transfer Acceleration on the bucket.
Why wrong: Transfer Acceleration improves upload speed, not encryption.
- B
Apply a bucket policy that denies PutObject without encryption.
Why wrong: This policy enforces encryption but does not actually encrypt objects; objects could still be uploaded with SSE-C.
- C
Use SSE-KMS to encrypt objects with AWS KMS.
SSE-KMS provides server-side encryption with customer-managed keys.
- D
Use client-side encryption before uploading objects.
Why wrong: Client-side encryption is performed by the client, not S3; it does not ensure at-rest encryption within S3.
- E
Enable default encryption on the S3 bucket using SSE-S3.
SSE-S3 provides server-side encryption with Amazon S3-managed keys.
Question 936 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 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 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
✓
Use SSE-KMS to encrypt objects with AWS KMS.
Option C is correct because SSE-KMS (Server-Side Encryption with AWS Key Management Service) allows you to encrypt objects at rest in S3 using customer-managed or AWS-managed KMS keys. This provides envelope encryption, separate key management, and audit trails via AWS CloudTrail, meeting compliance requirements for sensitive financial data.
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
The trap here is that candidates might think client-side encryption (Option D) is not a valid method for encryption at rest, or they might confuse S3 Transfer Acceleration (Option A) with encryption, or believe that a bucket policy (Option B) alone encrypts objects rather than just enforcing encryption requirements.
Detailed technical explanation
How to think about this question
SSE-KMS uses envelope encryption where a KMS key encrypts a data key, which then encrypts the object; this allows key rotation, access control, and audit logs. SSE-S3 uses AES-256 with Amazon-managed keys, providing a simpler, fully managed encryption at no additional cost. Both methods encrypt objects at rest, but SSE-KMS offers more control and compliance features, while SSE-S3 is transparent and automatic.
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: Use SSE-KMS to encrypt objects with AWS KMS. — Option C is correct because SSE-KMS (Server-Side Encryption with AWS Key Management Service) allows you to encrypt objects at rest in S3 using customer-managed or AWS-managed KMS keys. This provides envelope encryption, separate key management, and audit trails via AWS CloudTrail, meeting compliance requirements for sensitive financial data.
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
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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