- A
AWS Key Management Service (KMS)
Correct. AWS KMS is a managed service that allows you to create, rotate, control access to, and audit the use of encryption keys used to protect data in AWS services such as Amazon S3.
- B
Amazon S3 server-side encryption with customer-provided keys (SSE-C)
Why wrong: Incorrect. SSE-C requires the customer to provide and manage their own encryption keys. The company wants AWS to handle key management, so SSE-C is not suitable.
- C
AWS Certificate Manager (ACM)
Why wrong: Incorrect. AWS Certificate Manager is used to provision, manage, and deploy public and private SSL/TLS certificates for use with AWS services. It does not manage encryption keys for data at rest.
- D
AWS Secrets Manager
Why wrong: Incorrect. AWS Secrets Manager is designed to manage secrets such as database credentials and API keys. While it can help with key rotation, it is not the primary service for managing encryption keys for data at rest in Amazon S3.
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 buckets. The company's security policy requires that all objects in these buckets be encrypted at rest using an encryption key that the company can rotate annually and audit for usage. The company also needs to control which IAM users and roles can use, create, and manage these keys. The security team wants to use an AWS managed service to handle the key management lifecycle. Which AWS service should the company use to meet these requirements?
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 (KMS)
AWS Key Management Service (KMS) is the correct choice because it is a managed service that allows you to create, rotate, and audit customer-managed keys (CMKs) used for encrypting S3 objects at rest. KMS integrates with AWS CloudTrail to log every key usage, enabling the required audit trail, and supports annual key rotation via automatic or manual rotation. It also provides fine-grained IAM policies and key policies to control which users and roles can use, create, and manage the keys, meeting all stated requirements.
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 (KMS)
Why this is correct
Correct. AWS KMS is a managed service that allows you to create, rotate, control access to, and audit the use of encryption keys used to protect data in AWS services such as Amazon S3.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3 server-side encryption with customer-provided keys (SSE-C)
Why it's wrong here
Incorrect. SSE-C requires the customer to provide and manage their own encryption keys. The company wants AWS to handle key management, so SSE-C is not suitable.
- ✗
AWS Certificate Manager (ACM)
Why it's wrong here
Incorrect. AWS Certificate Manager is used to provision, manage, and deploy public and private SSL/TLS certificates for use with AWS services. It does not manage encryption keys for data at rest.
When this WOULD be correct
A company needs to issue and manage SSL/TLS certificates for a web application running on an Application Load Balancer, with automatic renewal and integration with AWS services. ACM would be the correct service to manage the certificate lifecycle.
- ✗
AWS Secrets Manager
Why it's wrong here
Incorrect. AWS Secrets Manager is designed to manage secrets such as database credentials and API keys. While it can help with key rotation, it is not the primary service for managing encryption keys for data at rest in Amazon S3.
When this WOULD be correct
A company needs to automatically rotate database credentials stored in a secure service and audit access to those credentials. AWS Secrets Manager would be the correct choice for managing and rotating secrets such as RDS passwords or API tokens.
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 (KMS)Correct answer▾
Why this is correct
Correct. AWS KMS is a managed service that allows you to create, rotate, control access to, and audit the use of encryption keys used to protect data in AWS services such as Amazon S3.
✗AWS Certificate Manager (ACM)Wrong answer — click to see why▾
Why this is wrong here
AWS Certificate Manager (ACM) handles SSL/TLS certificates for securing network traffic, not encryption keys for data at rest in S3. It does not provide key rotation or audit capabilities for S3 object encryption.
★ When this WOULD be the correct answer
A company needs to issue and manage SSL/TLS certificates for a web application running on an Application Load Balancer, with automatic renewal and integration with AWS services. ACM would be the correct service to manage the certificate lifecycle.
Why candidates choose this
Candidates may confuse certificate management with key management, as both involve cryptographic materials and lifecycle management, leading them to select ACM for encryption key requirements.
✗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 with rotation and audit capabilities. It does not provide the key management lifecycle features required for encrypting S3 objects.
★ When this WOULD be the correct answer
A company needs to automatically rotate database credentials stored in a secure service and audit access to those credentials. AWS Secrets Manager would be the correct choice for managing and rotating secrets such as RDS passwords or API tokens.
Why candidates choose this
Candidates may confuse Secrets Manager with KMS because both involve managing sensitive data and have 'secrets' in their name, leading them to think Secrets Manager can handle encryption key management.
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 Secrets Manager with KMS because both manage secrets, but Secrets Manager is for rotating application secrets like database passwords, not for managing encryption keys used for S3 server-side encryption, which is a core KMS function.
Detailed technical explanation
How to think about this question
Under the hood, AWS KMS uses hardware security modules (HSMs) validated under FIPS 140-2 to protect key material. When you enable automatic key rotation for a symmetric customer-managed key, KMS rotates the backing key annually while retaining the same key ID and key metadata, so existing encrypted data remains decryptable without re-encryption. In a real-world scenario, if a security policy requires key rotation every 365 days, KMS can be configured to rotate automatically, and CloudTrail logs will show the `RotateKey` API call and every `Decrypt` or `GenerateDataKey` operation for audit compliance.
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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Security and Compliance — study guide chapter
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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 (KMS) — AWS Key Management Service (KMS) is the correct choice because it is a managed service that allows you to create, rotate, and audit customer-managed keys (CMKs) used for encrypting S3 objects at rest. KMS integrates with AWS CloudTrail to log every key usage, enabling the required audit trail, and supports annual key rotation via automatic or manual rotation. It also provides fine-grained IAM policies and key policies to control which users and roles can use, create, and manage the keys, meeting all stated requirements.
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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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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