- A
AWS Certificate Manager (ACM)
Why wrong: ACM is used to provision, manage, and deploy SSL/TLS certificates for use with AWS services like Elastic Load Balancing and CloudFront. It does not provide encryption keys for S3 object encryption nor does it log key usage events.
- B
AWS Key Management Service (AWS KMS)
KMS enables you to create and manage customer-managed keys (CMKs) for encrypting data at rest in S3. It also integrates with AWS CloudTrail to log every key usage request, providing the required audit trail for compliance.
- C
AWS CloudHSM
Why wrong: CloudHSM provides dedicated hardware security modules (HSMs) in the cloud for generating and managing encryption keys. However, it does not natively log key usage to CloudTrail; you must configure additional logging and it is more complex to operate. KMS is simpler and provides integrated audit logging.
- D
AWS Secrets Manager
Why wrong: Secrets Manager is designed to manage secrets such as database credentials, API keys, and passwords. It can automatically rotate secrets, but it is not used to create encryption keys for S3 objects or to log key usage events.
Quick Answer
The answer is AWS Key Management Service (AWS KMS). This is the correct choice because KMS allows you to create a customer managed key (CMK) with annual rotation enabled, and it natively integrates with AWS CloudTrail to produce tamper-proof audit logs of every KMS API call—such as Decrypt, Encrypt, or GenerateDataKey—recording the key ID, the IAM principal that made the request, and the S3 object ARN via the encryption context. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your understanding that KMS handles both key lifecycle management and audit logging, while a common trap is to split the solution across services like S3 server-side encryption or separate logging tools. Remember that KMS is the single service that satisfies both requirements, and CloudTrail is its built-in audit partner. Memory tip: think “KMS handles the key, CloudTrail handles the log”—together they cover compliance.
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 financial services company must encrypt all sensitive customer data stored in Amazon S3 using an encryption key that the company manages and rotates annually. The company also needs a complete, tamper-proof record of every time the key is used (including who used it and on which object) to satisfy regulatory audit requirements. Which AWS service should the company use to meet both the key management and audit logging 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 (AWS KMS)
AWS KMS is the correct choice because it allows the company to create and manage a customer managed key (CMK) with annual rotation, and it integrates with AWS CloudTrail to deliver tamper-proof logs of every KMS API call (e.g., Decrypt, Encrypt, GenerateDataKey). These logs record the key ID, the IAM user or role that made the request, and the S3 object ARN (via encryption context), satisfying both key management and audit logging 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 Certificate Manager (ACM)
Why it's wrong here
ACM is used to provision, manage, and deploy SSL/TLS certificates for use with AWS services like Elastic Load Balancing and CloudFront. It does not provide encryption keys for S3 object encryption nor does it log key usage events.
- ✓
AWS Key Management Service (AWS KMS)
Why this is correct
KMS enables you to create and manage customer-managed keys (CMKs) for encrypting data at rest in S3. It also integrates with AWS CloudTrail to log every key usage request, providing the required audit trail for compliance.
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) in the cloud for generating and managing encryption keys. However, it does not natively log key usage to CloudTrail; you must configure additional logging and it is more complex to operate. KMS is simpler and provides integrated audit logging.
- ✗
AWS Secrets Manager
Why it's wrong here
Secrets Manager is designed to manage secrets such as database credentials, API keys, and passwords. It can automatically rotate secrets, but it is not used to create encryption keys for S3 objects or to log key usage events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS CloudHSM's hardware security with the integrated audit logging and automatic rotation capabilities of AWS KMS, assuming that a dedicated HSM is always required for regulatory compliance, when KMS with CloudTrail fully meets the tamper-proof audit requirement.
Detailed technical explanation
How to think about this question
Under the hood, AWS KMS uses envelope encryption where a CMK encrypts a data key, and that data key encrypts the S3 object; CloudTrail records the Decrypt API call with the encryption context (e.g., s3:arn:...:object/...), providing a tamper-proof audit trail. A subtle behavior is that if you disable key rotation or use an imported key material, you lose automatic annual rotation, and CloudTrail logs are immutable only if you enable CloudTrail log file validation (using SHA-256 hashing).
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.
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 (AWS KMS) — AWS KMS is the correct choice because it allows the company to create and manage a customer managed key (CMK) with annual rotation, and it integrates with AWS CloudTrail to deliver tamper-proof logs of every KMS API call (e.g., Decrypt, Encrypt, GenerateDataKey). These logs record the key ID, the IAM user or role that made the request, and the S3 object ARN (via encryption context), satisfying both key management and audit logging 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.
About these practice questions
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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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