- A
AWS Key Management Service (AWS KMS)
AWS KMS allows you to create customer managed keys (CMKs) and enables automatic annual key rotation, meeting the compliance requirement while maintaining customer control over key policies.
- B
AWS CloudHSM
Why wrong: AWS CloudHSM provides hardware security modules for dedicated cryptographic operations but does not offer automatic key rotation. It is designed for scenarios requiring FIPS 140-2 Level 3 validated hardware, not for automatic rotation.
- C
AWS Secrets Manager
Why wrong: AWS Secrets Manager is used to rotate secrets like database passwords, not encryption keys for data at rest. It does not provide the key management capabilities needed for S3 encryption.
- D
AWS Certificate Manager
Why wrong: AWS Certificate Manager manages SSL/TLS certificates for securing network traffic, not encryption keys for data at rest in S3.
AWS KMS Key Management with Automatic Rotation
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 has a compliance policy requiring that all data at rest in Amazon S3 be encrypted with a key that is automatically rotated every year. The company wants to manage the encryption keys themselves, maintain control over access policies, and have AWS handle the key rotation automatically. Which AWS service should the company use?
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
AWS Key Management Service (AWS KMS)
AWS KMS allows you to create customer managed keys (CMKs) with automatic annual rotation enabled. You retain control over key policies and access permissions, while AWS handles the rotation of the key material. This satisfies the compliance requirement for encrypted data at rest in S3 with automatic yearly key rotation.
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.
- ✓
AWS Key Management Service (AWS KMS)
Why this is correct
AWS KMS allows you to create customer managed keys (CMKs) and enables automatic annual key rotation, meeting the compliance requirement while maintaining customer control over key policies.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CloudHSM
Why it's wrong here
AWS CloudHSM provides hardware security modules for dedicated cryptographic operations but does not offer automatic key rotation. It is designed for scenarios requiring FIPS 140-2 Level 3 validated hardware, not for automatic rotation.
When this WOULD be correct
A company needs to store encryption keys in a dedicated hardware security module (HSM) under their sole control, with no AWS access to the keys, and is willing to manage key rotation manually or via custom scripts.
- ✗
AWS Secrets Manager
Why it's wrong here
AWS Secrets Manager is used to rotate secrets like database passwords, not encryption keys for data at rest. It does not provide the key management capabilities needed for S3 encryption.
When this WOULD be correct
A company needs to automatically rotate database credentials stored in a secure service, with built-in integration for RDS, Redshift, and DocumentDB. AWS Secrets Manager would be the correct choice for managing and rotating those secrets.
- ✗
AWS Certificate Manager
Why it's wrong here
AWS Certificate Manager manages SSL/TLS certificates for securing network traffic, not encryption keys for data at rest in S3.
When this WOULD be correct
A company needs to automatically renew and deploy SSL/TLS certificates for its web applications hosted on AWS, and wants AWS to handle certificate renewal without manual intervention.
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.
✓AWS Key Management Service (AWS KMS)Correct answer▾
Why this is correct
AWS KMS allows you to create customer managed keys (CMKs) and enables automatic annual key rotation, meeting the compliance requirement while maintaining customer control over key policies.
✗AWS CloudHSMWrong answer — click to see why▾
Why this is wrong here
AWS CloudHSM provides hardware-based key storage but does not offer automatic key rotation; the customer must manage rotation themselves, which violates the requirement for automatic yearly rotation.
★ When this WOULD be the correct answer
A company needs to store encryption keys in a dedicated hardware security module (HSM) under their sole control, with no AWS access to the keys, and is willing to manage key rotation manually or via custom scripts.
Why candidates choose this
Candidates may confuse CloudHSM's strong security and customer-managed keys with the automatic rotation feature, not realizing that CloudHSM lacks built-in automatic key rotation.
✗AWS Secrets ManagerWrong answer — click to see why▾
Why this is wrong here
AWS Secrets Manager is designed for managing secrets like database credentials and API keys, not for managing encryption keys for S3 data at rest. It does not provide the key rotation and access control policies needed for S3 encryption.
★ When this WOULD be the correct answer
A company needs to automatically rotate database credentials stored in a secure service, with built-in integration for RDS, Redshift, and DocumentDB. AWS Secrets Manager would be the correct choice for managing and rotating those secrets.
Why candidates choose this
Candidates may confuse Secrets Manager with KMS because both involve 'secrets' and 'rotation', but Secrets Manager handles application secrets, not encryption keys for data at rest.
✗AWS Certificate ManagerWrong answer — click to see why▾
Why this is wrong here
AWS Certificate Manager is used to manage SSL/TLS certificates for securing network traffic, not for encrypting data at rest in S3. It does not provide key rotation for S3 encryption keys.
★ When this WOULD be the correct answer
A company needs to automatically renew and deploy SSL/TLS certificates for its web applications hosted on AWS, and wants AWS to handle certificate renewal without manual intervention.
Why candidates choose this
Candidates may confuse 'key rotation' with 'certificate renewal' and think ACM's automatic renewal applies to encryption keys, not understanding that ACM manages certificates, not encryption keys for S3.
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 confusing AWS KMS with AWS CloudHSM, as both involve encryption keys, but CloudHSM requires you to manage key rotation manually, failing the automatic rotation requirement.
Trap categories for this question
Scenario analysis trap
AWS CloudHSM provides hardware security modules for dedicated cryptographic operations but does not offer automatic key rotation. It is designed for scenarios requiring FIPS 140-2 Level 3 validated hardware, not for automatic rotation.
Detailed technical explanation
How to think about this question
AWS KMS uses envelope encryption where a CMK encrypts data keys, which then encrypt your data. When automatic key rotation is enabled, KMS generates new cryptographic material for the CMK annually while retaining the old material for decryption of existing data. This is transparent to applications using the CMK via the GenerateDataKey and Decrypt APIs.
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: AWS Key Management Service (AWS KMS) — AWS KMS allows you to create customer managed keys (CMKs) with automatic annual rotation enabled. You retain control over key policies and access permissions, while AWS handles the rotation of the key material. This satisfies the compliance requirement for encrypted data at rest in S3 with automatic yearly key rotation.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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