- A
AWS Certificate Manager (ACM)
Why wrong: ACM is used to provision, manage, and deploy public and private SSL/TLS certificates for use with AWS services. It does not provide encryption keys for data at rest or support key rotation for S3 objects.
- B
AWS Key Management Service (KMS) with a customer managed key
KMS with a customer managed key enables you to create and control the lifecycle of encryption keys. Automatic key rotation every 365 days is supported for customer managed keys, and all key usage is recorded in CloudTrail for auditing.
- C
AWS CloudHSM
Why wrong: CloudHSM provides dedicated hardware security modules (HSMs) for key generation and storage. However, automatic key rotation is not a built-in feature of CloudHSM; you would need to implement custom automation to rotate keys, which adds complexity.
- D
Amazon S3 server-side encryption with S3-managed keys (SSE-S3)
Why wrong: SSE-S3 encrypts data at rest using keys managed by AWS. The customer does not have control over key rotation or visibility into key usage logs, and the keys are rotated automatically by AWS without customer intervention or customization.
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 operates a healthcare application on AWS that must comply with HIPAA regulations. The application stores sensitive patient data in Amazon S3. The compliance team requires that all data at rest in S3 be encrypted with a key that the company manages. The company also needs the ability to automatically rotate the encryption key every 365 days and to audit all key usage through AWS CloudTrail. 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) with a customer managed key
AWS KMS with a customer managed key (CMK) allows the company to create and control the encryption key used for S3 server-side encryption, meeting HIPAA's requirement for customer-managed keys. KMS supports automatic key rotation every 365 days (or custom period) and integrates with AWS CloudTrail to log every key usage (e.g., Decrypt, Encrypt API calls) for auditing. This combination satisfies all stated requirements: encryption at rest, customer-managed key, automatic rotation, 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.
- ✗
AWS Certificate Manager (ACM)
Why it's wrong here
ACM is used to provision, manage, and deploy public and private SSL/TLS certificates for use with AWS services. It does not provide encryption keys for data at rest or support key rotation for S3 objects.
When this WOULD be correct
A company needs to issue, manage, and automatically renew public or private SSL/TLS certificates for securing network traffic to an AWS load balancer or CloudFront distribution, with integration for certificate deployment.
- ✓
AWS Key Management Service (KMS) with a customer managed key
Why this is correct
KMS with a customer managed key enables you to create and control the lifecycle of encryption keys. Automatic key rotation every 365 days is supported for customer managed keys, and all key usage is recorded in CloudTrail for auditing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CloudHSM
Why it's wrong here
CloudHSM provides dedicated hardware security modules (HSMs) for key generation and storage. However, automatic key rotation is not a built-in feature of CloudHSM; you would need to implement custom automation to rotate keys, which adds complexity.
When this WOULD be correct
A company must store encryption keys in a dedicated, FIPS 140-2 Level 3 validated hardware security module (HSM) and requires full control over key management without AWS having access to the keys. The company does not need automatic key rotation or CloudTrail integration for key usage.
- ✗
Amazon S3 server-side encryption with S3-managed keys (SSE-S3)
Why it's wrong here
SSE-S3 encrypts data at rest using keys managed by AWS. The customer does not have control over key rotation or visibility into key usage logs, and the keys are rotated automatically by AWS without customer intervention or customization.
When this WOULD be correct
If the question required encryption at rest with minimal management overhead and no need for customer-managed keys or key rotation, SSE-S3 would be correct. For example, a non-sensitive application where AWS-managed keys are acceptable and compliance does not mandate customer control.
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) with a customer managed keyCorrect answer▾
Why this is correct
KMS with a customer managed key enables you to create and control the lifecycle of encryption keys. Automatic key rotation every 365 days is supported for customer managed keys, and all key usage is recorded in CloudTrail for auditing.
✗AWS Certificate Manager (ACM)Wrong answer — click to see why▾
Why this is wrong here
ACM manages SSL/TLS certificates for encryption in transit, not encryption at rest. It does not provide key management for S3 data encryption or key rotation capabilities.
★ When this WOULD be the correct answer
A company needs to issue, manage, and automatically renew public or private SSL/TLS certificates for securing network traffic to an AWS load balancer or CloudFront distribution, with integration for certificate deployment.
Why candidates choose this
Candidates may confuse certificate management for encryption in transit with key management for encryption at rest, or assume ACM handles all encryption needs on AWS.
✗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 or native integration with AWS CloudTrail for key usage auditing. The question requires automatic rotation every 365 days and CloudTrail auditing, which are features of AWS KMS, not CloudHSM.
★ When this WOULD be the correct answer
A company must store encryption keys in a dedicated, FIPS 140-2 Level 3 validated hardware security module (HSM) and requires full control over key management without AWS having access to the keys. The company does not need automatic key rotation or CloudTrail integration for key usage.
Why candidates choose this
Candidates may think CloudHSM is required for HIPAA compliance due to its high security level, or they may confuse the need for customer-managed keys with the need for dedicated hardware, not realizing that KMS customer managed keys meet the requirements without the operational overhead of CloudHSM.
✗Amazon S3 server-side encryption with S3-managed keys (SSE-S3)Wrong answer — click to see why▾
Why this is wrong here
SSE-S3 uses encryption keys managed entirely by AWS, not by the customer. The requirement specifies that the company must manage the encryption key, and SSE-S3 does not provide customer-managed key rotation or auditing via CloudTrail.
★ When this WOULD be the correct answer
If the question required encryption at rest with minimal management overhead and no need for customer-managed keys or key rotation, SSE-S3 would be correct. For example, a non-sensitive application where AWS-managed keys are acceptable and compliance does not mandate customer control.
Why candidates choose this
Candidates may confuse SSE-S3 with server-side encryption options that support customer keys, or assume that S3 encryption alone meets HIPAA requirements without considering key management and auditing 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 may confuse AWS CloudHSM (which offers dedicated HSM control) with KMS's simpler managed rotation and auditing, overlooking that CloudHSM requires manual rotation and lacks native CloudTrail integration for key usage logs.
Detailed technical explanation
How to think about this question
KMS customer managed keys (CMKs) use envelope encryption: the CMK encrypts a data key, which then encrypts the S3 object. Automatic rotation creates a new backing key for the CMK every 365 days, but the old key remains available to decrypt existing data. CloudTrail logs every KMS API call (e.g., GenerateDataKey, Decrypt) with the key ID and caller identity, enabling compliance audits. For HIPAA, KMS is a validated service under the AWS HIPAA eligible services list.
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 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) with a customer managed key — AWS KMS with a customer managed key (CMK) allows the company to create and control the encryption key used for S3 server-side encryption, meeting HIPAA's requirement for customer-managed keys. KMS supports automatic key rotation every 365 days (or custom period) and integrates with AWS CloudTrail to log every key usage (e.g., Decrypt, Encrypt API calls) for auditing. This combination satisfies all stated requirements: encryption at rest, customer-managed key, automatic rotation, 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.
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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