- A
Enable automatic key rotation on the KMS key.
This is a requirement.
- B
Use SSE-KMS with an AWS managed key.
Why wrong: AWS managed keys do not support automatic rotation.
- C
Set the default encryption on the S3 bucket to SSE-KMS with the CMK.
This ensures all objects are encrypted.
- D
Use SSE-KMS with a customer-managed key (CMK).
CMKs support automatic rotation.
- E
Use SSE-C with a customer-provided key.
Why wrong: SSE-C does not support key rotation.
Question 85 of 1,786
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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 designing a data lake on Amazon S3. The security policy requires that all data be encrypted at rest using AWS KMS with automatic key rotation. Which encryption option meets these requirements? (Select THREE.)
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
✓
Enable automatic key rotation on the KMS key.
Option A is correct because AWS KMS customer-managed keys (CMKs) support automatic key rotation, which can be enabled to rotate the key material annually. This satisfies the security policy requirement for automatic key rotation. SSE-KMS with a CMK (Option D) is also required because AWS managed keys (Option B) do not support automatic key rotation, and SSE-C (Option E) does not use KMS at all. Setting default encryption on the S3 bucket to SSE-KMS with the CMK (Option C) ensures all objects are encrypted with that key, meeting the encryption-at-rest requirement.
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 automatic key rotation on the KMS key.
Why this is correct
This is a requirement.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use SSE-KMS with an AWS managed key.
Why it's wrong here
AWS managed keys do not support automatic rotation.
- ✓
Set the default encryption on the S3 bucket to SSE-KMS with the CMK.
Why this is correct
This ensures all objects are encrypted.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use SSE-KMS with a customer-managed key (CMK).
Why this is correct
CMKs support automatic rotation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use SSE-C with a customer-provided key.
Why it's wrong here
SSE-C does not support key rotation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume AWS managed keys (aws/s3) support automatic key rotation, but they do not; only customer-managed CMKs allow you to enable automatic rotation, and the question requires selecting three correct options that together meet both the KMS and automatic rotation requirements.
Detailed technical explanation
How to think about this question
AWS KMS automatic key rotation for customer-managed CMKs rotates the backing key annually, but the key ID, ARN, and metadata remain unchanged, so existing encrypted data remains decryptable. Under the hood, KMS creates new backing key versions while retaining old ones, enabling seamless re-encryption of new data. In a real-world scenario, if the policy requires compliance with standards like PCI DSS or SOC 2, automatic key rotation is often mandatory, and using SSE-KMS with a CMK allows the organization to meet audit requirements while maintaining control over the key lifecycle.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable automatic key rotation on the KMS key. — Option A is correct because AWS KMS customer-managed keys (CMKs) support automatic key rotation, which can be enabled to rotate the key material annually. This satisfies the security policy requirement for automatic key rotation. SSE-KMS with a CMK (Option D) is also required because AWS managed keys (Option B) do not support automatic key rotation, and SSE-C (Option E) does not use KMS at all. Setting default encryption on the S3 bucket to SSE-KMS with the CMK (Option C) ensures all objects are encrypted with that key, meeting the encryption-at-rest requirement.
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: Jun 11, 2026
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