- A
Enable CloudTrail log file integrity validation
Correct. Log file integrity validation uses hash-based digital signatures to verify that CloudTrail log files have not been modified or deleted after they were delivered to the S3 bucket. It is a built-in, cost-effective feature designed for this purpose.
- B
Enable server-side encryption for the CloudTrail log file S3 bucket using SSE-KMS
Why wrong: Incorrect. Server-side encryption protects the confidentiality of the log files at rest, but it does not provide any mechanism to detect tampering or verify that the files have not been altered. Encryption does not ensure integrity.
- C
Configure CloudTrail to send logs to CloudWatch Logs and set a metric filter for changes
Why wrong: Incorrect. Sending logs to CloudWatch Logs allows real-time monitoring and alerting based on log content, but it does not provide a cryptographic verification that the original log files stored in S3 have not been tampered with. The CloudWatch Logs copy could also be altered.
- D
Enable multi-factor authentication (MFA) delete on the S3 bucket
Why wrong: Incorrect. MFA delete adds an additional authentication requirement to delete objects, which helps prevent unauthorized deletion. However, it does not detect or prevent modification of the log file content after it is written, nor does it provide any integrity verification.
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 uses AWS CloudTrail to log all API calls in their AWS account for compliance and security auditing. Their compliance officer needs to prove to an external auditor that the CloudTrail log files have not been altered or deleted after they were created. The company must use the most cost-effective and built-in AWS feature to detect any tampering with the log files. What should the company enable?
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
Enable CloudTrail log file integrity validation
CloudTrail log file integrity validation uses a hash chain (SHA-256) to create a digest file that is signed with a private key, allowing you to verify that log files have not been modified, deleted, or tampered with after delivery. This is a built-in, no-cost feature that directly meets the compliance officer's requirement to prove log integrity to an external auditor without additional services or costs.
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.
- ✓
Enable CloudTrail log file integrity validation
Why this is correct
Correct. Log file integrity validation uses hash-based digital signatures to verify that CloudTrail log files have not been modified or deleted after they were delivered to the S3 bucket. It is a built-in, cost-effective feature designed for this purpose.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable server-side encryption for the CloudTrail log file S3 bucket using SSE-KMS
Why it's wrong here
Incorrect. Server-side encryption protects the confidentiality of the log files at rest, but it does not provide any mechanism to detect tampering or verify that the files have not been altered. Encryption does not ensure integrity.
- ✗
Configure CloudTrail to send logs to CloudWatch Logs and set a metric filter for changes
Why it's wrong here
Incorrect. Sending logs to CloudWatch Logs allows real-time monitoring and alerting based on log content, but it does not provide a cryptographic verification that the original log files stored in S3 have not been tampered with. The CloudWatch Logs copy could also be altered.
- ✗
Enable multi-factor authentication (MFA) delete on the S3 bucket
Why it's wrong here
Incorrect. MFA delete adds an additional authentication requirement to delete objects, which helps prevent unauthorized deletion. However, it does not detect or prevent modification of the log file content after it is written, nor does it provide any integrity verification.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse encryption (which protects confidentiality) with integrity validation (which proves data has not been altered), leading them to choose SSE-KMS or MFA delete instead of the built-in, cost-free integrity validation feature.
Detailed technical explanation
How to think about this question
CloudTrail integrity validation works by periodically creating digest files that contain hashes of the log files and the previous digest file, forming a chain. Each digest file is signed using a private key from AWS, and you can verify the signature using the public key available in the AWS documentation. This mechanism is similar to a blockchain-like structure and is validated using the `aws cloudtrail validate-logs` CLI command, which checks the hash chain and signature without needing any external key management.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Enable CloudTrail log file integrity validation — CloudTrail log file integrity validation uses a hash chain (SHA-256) to create a digest file that is signed with a private key, allowing you to verify that log files have not been modified, deleted, or tampered with after delivery. This is a built-in, no-cost feature that directly meets the compliance officer's requirement to prove log integrity to an external auditor without additional services or costs.
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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