- A
AWS Key Management Service (KMS) with a customer managed key
Why wrong: AWS KMS uses shared HSMs and provides FIPS 140-2 Level 2 validation (Level 3 in select regions), but the customer does not have dedicated, isolated HSM hardware. AWS retains some administrative access to the HSM infrastructure. This does not meet the requirement for exclusive customer control and Level 3 validation.
- B
AWS CloudHSM
AWS CloudHSM provides dedicated HSMs that are FIPS 140-2 Level 3 validated. Customers have full control over the HSMs and the keys stored inside them, including the ability to rotate and delete keys. AWS cannot access the keys because the HSMs are dedicated to the customer and managed by the customer.
- C
AWS Secrets Manager
Why wrong: AWS Secrets Manager is a service for securely storing and rotating secrets (e.g., passwords, API keys). It does not provide dedicated HSM hardware or FIPS 140-2 Level 3 validation. It is not designed for generating or storing encryption keys for data at rest.
- D
AWS Certificate Manager (ACM)
Why wrong: AWS Certificate Manager handles SSL/TLS certificate provisioning, renewal, and deployment. It does not generate or store encryption keys for S3 data at rest, nor does it offer dedicated HSM capabilities with FIPS 140-2 Level 3 validation.
Quick Answer
AWS CloudHSM is the correct choice because it provides dedicated hardware security modules validated under FIPS 140-2 Level 3 for key management, ensuring encryption keys are generated and stored entirely within the HSM with no AWS access. This service gives you full control over the key lifecycle, including rotation and deletion, which directly meets the financial services company’s strict compliance and security requirements. On the AWS Certified Cloud Practitioner CLF-C02 exam, this scenario tests your ability to distinguish between managed key services: AWS KMS is a shared, AWS-managed service, while CloudHSM gives you exclusive, single-tenant control. A common trap is choosing KMS because it also handles encryption, but remember that KMS does not prevent AWS from having access to your keys, and it is not a dedicated HSM. For the exam, think “CloudHSM = Customer-controlled HSM; KMS = AWS-managed keys.” A helpful memory tip: “CloudHSM: Your keys, your cage—AWS can’t turn the page.”
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 stores sensitive transaction data in Amazon S3. The company must encrypt the data at rest using keys that are stored in a hardware security module (HSM) validated under FIPS 140-2 Level 3. Additionally, the company requires full control over the key lifecycle, including rotation and deletion, and AWS must not have any access to the keys. Which AWS service should the company use to generate and store the encryption keys?
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 CloudHSM
AWS CloudHSM is the correct choice because it provides dedicated hardware security modules (HSMs) that are validated under FIPS 140-2 Level 3, allowing you to generate and store encryption keys entirely within the HSM. With CloudHSM, AWS has no access to your keys, and you retain full control over key lifecycle operations such as rotation and deletion, meeting the strict compliance and security requirements of the financial services company.
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) with a customer managed key
Why it's wrong here
AWS KMS uses shared HSMs and provides FIPS 140-2 Level 2 validation (Level 3 in select regions), but the customer does not have dedicated, isolated HSM hardware. AWS retains some administrative access to the HSM infrastructure. This does not meet the requirement for exclusive customer control and Level 3 validation.
- ✓
AWS CloudHSM
Why this is correct
AWS CloudHSM provides dedicated HSMs that are FIPS 140-2 Level 3 validated. Customers have full control over the HSMs and the keys stored inside them, including the ability to rotate and delete keys. AWS cannot access the keys because the HSMs are dedicated to the customer and managed by the customer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Secrets Manager
Why it's wrong here
AWS Secrets Manager is a service for securely storing and rotating secrets (e.g., passwords, API keys). It does not provide dedicated HSM hardware or FIPS 140-2 Level 3 validation. It is not designed for generating or storing encryption keys for data at rest.
- ✗
AWS Certificate Manager (ACM)
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS KMS customer managed keys with full customer control, but KMS still allows AWS to manage the underlying HSM infrastructure and does not meet FIPS 140-2 Level 3 requirements, whereas CloudHSM provides exclusive customer control and a higher validation level.
Detailed technical explanation
How to think about this question
AWS CloudHSM provides a dedicated, single-tenant HSM appliance that runs the FIPS 140-2 Level 3 validated firmware, ensuring that cryptographic operations occur within the hardware boundary. You manage keys via the CloudHSM client software using PKCS#11, Java JCE, or Microsoft CNG interfaces, and you can enforce key rotation and deletion policies directly on the HSM. In a real-world scenario, a financial institution might use CloudHSM to generate a master key for envelope encryption, where the data key is used in S3 server-side encryption with customer-provided keys (SSE-C) or client-side encryption, ensuring that AWS never sees the plaintext key.
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 CloudHSM — AWS CloudHSM is the correct choice because it provides dedicated hardware security modules (HSMs) that are validated under FIPS 140-2 Level 3, allowing you to generate and store encryption keys entirely within the HSM. With CloudHSM, AWS has no access to your keys, and you retain full control over key lifecycle operations such as rotation and deletion, meeting the strict compliance and security requirements of the financial services company.
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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