- A
Use an AWS KMS customer managed key (CMK) with automatic key rotation enabled.
Correct. A customer managed CMK provides full control over the key, allows automatic yearly rotation, and integrates with CloudTrail for auditing all key usage.
- B
Use an AWS KMS AWS managed key with automatic key rotation.
Why wrong: Incorrect. AWS managed keys are managed by AWS; the customer cannot revoke or disable the key, and rotation is handled automatically but not configurable by the customer.
- C
Use Amazon S3 server-side encryption with SSE-S3.
Why wrong: Incorrect. SSE-S3 uses S3-managed encryption keys. The customer has no control over the key, cannot revoke access, and key usage is not auditable via CloudTrail.
- D
Use AWS CloudHSM to generate and manage the key.
Why wrong: Incorrect. AWS CloudHSM provides dedicated hardware security modules but does not offer automatic key rotation natively, and key usage auditing is not integrated with CloudTrail in the same way as KMS.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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 stores sensitive customer data in Amazon S3. The security policy requires that all objects be encrypted at rest using an encryption key that is automatically rotated every 12 months. The company must retain full control over the key, including the ability to immediately revoke access to the key if a security incident occurs. The security team also needs to audit every use of the key through AWS CloudTrail. Which key management solution should the company choose to meet these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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 an AWS KMS customer managed key (CMK) with automatic key rotation enabled.
AWS KMS customer managed keys (CMKs) allow you to enable automatic annual key rotation (every 12 months) and retain full control over the key, including the ability to immediately revoke access by disabling or deleting the key. CloudTrail integration is inherent with KMS, logging every use of the key via the `Decrypt` and `GenerateDataKey` API calls, meeting the audit requirement. This combination satisfies all stated security policy needs: encryption at rest, automatic rotation, full control, immediate revocation, and auditability.
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 an AWS KMS customer managed key (CMK) with automatic key rotation enabled.
Why this is correct
Correct. A customer managed CMK provides full control over the key, allows automatic yearly rotation, and integrates with CloudTrail for auditing all key usage.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an AWS KMS AWS managed key with automatic key rotation.
Why it's wrong here
Incorrect. AWS managed keys are managed by AWS; the customer cannot revoke or disable the key, and rotation is handled automatically but not configurable by the customer.
When this WOULD be correct
If the requirement is to encrypt data at rest with minimal management overhead and automatic rotation is acceptable, but the customer does not need full control over the key or the ability to revoke it immediately, an AWS managed key would be appropriate.
- ✗
Use Amazon S3 server-side encryption with SSE-S3.
Why it's wrong here
Incorrect. SSE-S3 uses S3-managed encryption keys. The customer has no control over the key, cannot revoke access, and key usage is not auditable via CloudTrail.
When this WOULD be correct
A company needs server-side encryption for S3 objects at rest with minimal management overhead, no requirement for customer-controlled key rotation, and no need for CloudTrail auditing of key usage. SSE-S3 provides automatic encryption with S3-managed keys.
- ✗
Use AWS CloudHSM to generate and manage the key.
Why it's wrong here
Incorrect. AWS CloudHSM provides dedicated hardware security modules but does not offer automatic key rotation natively, and key usage auditing is not integrated with CloudTrail in the same way as KMS.
When this WOULD be correct
A company requires a dedicated hardware security module (HSM) to generate and manage keys for regulatory compliance (e.g., FIPS 140-2 Level 3), and is willing to implement manual key rotation and separate auditing mechanisms (e.g., using CloudHSM logs with custom integration).
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use an AWS KMS customer managed key (CMK) with automatic key rotation enabled.Correct answer▾
Why this is correct
Correct. A customer managed CMK provides full control over the key, allows automatic yearly rotation, and integrates with CloudTrail for auditing all key usage.
✗Use an AWS KMS AWS managed key with automatic key rotation.Wrong answer — click to see why▾
Why this is wrong here
AWS managed keys do not allow customers to control key rotation, view key metadata, or manage key policies, and they cannot be immediately revoked or deleted by the customer.
★ When this WOULD be the correct answer
If the requirement is to encrypt data at rest with minimal management overhead and automatic rotation is acceptable, but the customer does not need full control over the key or the ability to revoke it immediately, an AWS managed key would be appropriate.
Why candidates choose this
Candidates may confuse AWS managed keys with customer managed keys, assuming both offer the same level of control and auditability, or they may think that automatic rotation is the only requirement.
✗Use Amazon S3 server-side encryption with SSE-S3.Wrong answer — click to see why▾
Why this is wrong here
SSE-S3 uses S3-managed keys, which do not allow customer control, automatic rotation every 12 months, or auditing through CloudTrail. The question requires customer-managed keys with full control and auditability.
★ When this WOULD be the correct answer
A company needs server-side encryption for S3 objects at rest with minimal management overhead, no requirement for customer-controlled key rotation, and no need for CloudTrail auditing of key usage. SSE-S3 provides automatic encryption with S3-managed keys.
Why candidates choose this
Candidates may assume SSE-S3 meets encryption requirements because it encrypts data at rest, but they overlook the specific needs for customer control, key rotation, and auditing.
✗Use AWS CloudHSM to generate and manage the key.Wrong answer — click to see why▾
Why this is wrong here
AWS CloudHSM does not provide automatic key rotation; key rotation must be managed manually. Additionally, CloudHSM does not integrate with AWS CloudTrail for key usage auditing, as it lacks native key usage logging.
★ When this WOULD be the correct answer
A company requires a dedicated hardware security module (HSM) to generate and manage keys for regulatory compliance (e.g., FIPS 140-2 Level 3), and is willing to implement manual key rotation and separate auditing mechanisms (e.g., using CloudHSM logs with custom integration).
Why candidates choose this
Candidates may think CloudHSM offers more control and security for sensitive data, and may overlook the specific requirements for automatic rotation and CloudTrail auditing, assuming CloudHSM can meet all key management needs.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS managed keys (which also rotate automatically) with customer managed keys, overlooking the requirement for full customer control and immediate revocation capability that only customer managed keys provide.
Detailed technical explanation
How to think about this question
AWS KMS customer managed keys support automatic rotation with a configurable annual period (365 days) by default, but you can also manually rotate the key at any time. When you disable or schedule deletion of a CMK, all subsequent decryption requests fail immediately, providing instant revocation. CloudTrail records every KMS `Encrypt`, `Decrypt`, and `GenerateDataKey` call with the key ARN, enabling detailed auditing of key usage per object.
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 CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use an AWS KMS customer managed key (CMK) with automatic key rotation enabled. — AWS KMS customer managed keys (CMKs) allow you to enable automatic annual key rotation (every 12 months) and retain full control over the key, including the ability to immediately revoke access by disabling or deleting the key. CloudTrail integration is inherent with KMS, logging every use of the key via the `Decrypt` and `GenerateDataKey` API calls, meeting the audit requirement. This combination satisfies all stated security policy needs: encryption at rest, automatic rotation, full control, immediate revocation, and auditability.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
This CLF-C02 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 CLF-C02 exam.
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