- A
Amazon S3 server-side encryption with Amazon S3-managed keys (SSE-S3)
Why wrong: SSE-S3 uses keys managed entirely by AWS. The customer cannot control key rotation or view key usage logs, which does not meet the requirements for maintaining control and logging.
- B
AWS Key Management Service (AWS KMS) with customer managed keys
With customer managed keys in AWS KMS, the company has full control over the encryption keys, can set automatic key rotation, and can audit key usage through AWS CloudTrail. This matches all stated requirements.
- C
Amazon S3 server-side encryption with customer-provided keys (SSE-C)
Why wrong: SSE-C requires the customer to provide their own encryption key with each API request. AWS does not store the key, so automated rotation and centralized logging of key usage are not supported.
- D
AWS Certificate Manager (ACM)
Why wrong: ACM is used to provision, manage, and deploy SSL/TLS certificates for securing network traffic. It does not provide encryption of 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 healthcare company is required to encrypt all protected health information (PHI) stored in Amazon S3. The company must maintain control over the encryption keys, rotate them annually, and log all key usage. Which AWS service or feature should they 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 (AWS KMS) with customer managed keys
AWS KMS with customer managed keys is correct because it allows the healthcare company to maintain full control over the encryption keys, enforce annual rotation (via automatic or manual key rotation), and log all key usage through AWS CloudTrail. This meets the compliance requirements for protecting PHI in S3 while retaining key management authority.
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.
- ✗
Amazon S3 server-side encryption with Amazon S3-managed keys (SSE-S3)
Why it's wrong here
SSE-S3 uses keys managed entirely by AWS. The customer cannot control key rotation or view key usage logs, which does not meet the requirements for maintaining control and logging.
When this WOULD be correct
A company needs to encrypt S3 data at rest with minimal management overhead and does not require control over the encryption keys, key rotation, or key usage logging. For example, a non-sensitive data storage requirement where default encryption is sufficient.
- ✓
AWS Key Management Service (AWS KMS) with customer managed keys
Why this is correct
With customer managed keys in AWS KMS, the company has full control over the encryption keys, can set automatic key rotation, and can audit key usage through AWS CloudTrail. This matches all stated requirements.
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
SSE-C requires the customer to provide their own encryption key with each API request. AWS does not store the key, so automated rotation and centralized logging of key usage are not supported.
When this WOULD be correct
A company needs to encrypt data in Amazon S3 but must maintain full control over the encryption keys and cannot store them in AWS. The company has its own key management infrastructure and wants to provide the keys with each request, without AWS storing or managing the keys.
- ✗
AWS Certificate Manager (ACM)
Why it's wrong here
ACM is used to provision, manage, and deploy SSL/TLS certificates for securing network traffic. It does not provide encryption of data at rest in Amazon S3.
When this WOULD be correct
A company needs to manage SSL/TLS certificates for their web application to enable HTTPS, and they want to automate certificate renewals and deployment on AWS resources like CloudFront or Application Load Balancer.
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) with customer managed keysCorrect answer▾
Why this is correct
With customer managed keys in AWS KMS, the company has full control over the encryption keys, can set automatic key rotation, and can audit key usage through AWS CloudTrail. This matches all stated requirements.
✗Amazon S3 server-side encryption with Amazon S3-managed keys (SSE-S3)Wrong answer — click to see why▾
Why this is wrong here
SSE-S3 uses Amazon-managed keys, not customer-managed keys, so the company cannot maintain control over the keys, rotate them annually, or log key usage.
★ When this WOULD be the correct answer
A company needs to encrypt S3 data at rest with minimal management overhead and does not require control over the encryption keys, key rotation, or key usage logging. For example, a non-sensitive data storage requirement where default encryption is sufficient.
Why candidates choose this
Candidates may assume SSE-S3 provides encryption and overlook the specific requirements for key control, rotation, and logging, thinking any server-side encryption meets compliance needs.
✗Amazon S3 server-side encryption with customer-provided keys (SSE-C)Wrong answer — click to see why▾
Why this is wrong here
SSE-C requires the customer to manage the encryption keys themselves, including key rotation and logging, but AWS does not log key usage for SSE-C; the customer must implement their own logging. The question requires AWS to log all key usage, which SSE-C does not provide.
★ When this WOULD be the correct answer
A company needs to encrypt data in Amazon S3 but must maintain full control over the encryption keys and cannot store them in AWS. The company has its own key management infrastructure and wants to provide the keys with each request, without AWS storing or managing the keys.
Why candidates choose this
Candidates may think SSE-C gives them full control over keys and rotation, but they overlook that AWS does not log key usage with SSE-C, and the requirement for logging key usage is explicitly stated in the question.
✗AWS Certificate Manager (ACM)Wrong answer — click to see why▾
Why this is wrong here
AWS Certificate Manager (ACM) is used for managing SSL/TLS certificates, not for encrypting data at rest in S3 or managing encryption keys.
★ When this WOULD be the correct answer
A company needs to manage SSL/TLS certificates for their web application to enable HTTPS, and they want to automate certificate renewals and deployment on AWS resources like CloudFront or Application Load Balancer.
Why candidates choose this
Candidates may confuse 'encryption' with 'certificates' and think ACM handles key management for data encryption, or they may misread the requirement as needing to secure data in transit rather than at rest.
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 SSE-S3 (which is simpler but lacks key control and logging) with the required key management and audit capabilities, or they mistakenly think ACM can be used for S3 encryption when it only handles transport layer security.
Detailed technical explanation
How to think about this question
AWS KMS customer managed keys use envelope encryption, where a CMK encrypts a data key that is then used to encrypt S3 objects; this allows key rotation without re-encrypting data. CloudTrail logs every KMS API call (e.g., Decrypt, Encrypt, GenerateDataKey) for auditing, and automatic rotation can be set to occur annually (or manually for more frequent rotation). In a real-world healthcare scenario, this ensures compliance with HIPAA by providing both key control and audit trails.
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.
- →
Security and Compliance — study guide chapter
Learn the concepts, then practise the questions
- →
Security and Compliance practice questions
Targeted practice on this topic area only
- →
All CLF-C02 questions
1,024 questions across all exam domains
- →
AWS Certified Cloud Practitioner CLF-C02 study guide
Full concept coverage aligned to exam objectives
- →
CLF-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CLF-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Cloud Concepts practice questions
Practise CLF-C02 questions linked to Cloud Concepts.
Security and Compliance practice questions
Practise CLF-C02 questions linked to Security and Compliance.
Cloud Technology and Services practice questions
Practise CLF-C02 questions linked to Cloud Technology and Services.
Billing, Pricing, and Support practice questions
Practise CLF-C02 questions linked to Billing, Pricing, and Support.
AWS shared responsibility model practice questions
Practise CLF-C02 questions linked to AWS shared responsibility model.
AWS IAM practice questions
Practise CLF-C02 questions linked to AWS IAM.
AWS pricing practice questions
Practise CLF-C02 questions linked to AWS pricing.
AWS support plans practice questions
Practise CLF-C02 questions linked to AWS support plans.
AWS S3 practice questions
Practise CLF-C02 questions linked to AWS S3.
AWS EC2 practice questions
Practise CLF-C02 questions linked to AWS EC2.
Practice this exam
Start a free CLF-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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) with customer managed keys — AWS KMS with customer managed keys is correct because it allows the healthcare company to maintain full control over the encryption keys, enforce annual rotation (via automatic or manual key rotation), and log all key usage through AWS CloudTrail. This meets the compliance requirements for protecting PHI in S3 while retaining key management authority.
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
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 →
Keep practising
More CLF-C02 practice questions
- A company publishes a message each time a new product is added to its catalogue. Three services need to receive this mes…
- A media company stores frequently accessed video thumbnails in Amazon S3. The thumbnails are read multiple times every d…
- A company needs a service to translate domain names (like www.example.com) into IP addresses, check the health of their…
- A startup runs an application on AWS and receives a monthly bill that charges exactly for the number of compute hours us…
- A financial institution runs its core banking application on-premises due to regulatory requirements. It has connected i…
- A company wants to run a MySQL database in AWS without managing database software installation, applying patches, settin…
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.