Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A financial services company uses AWS CloudTrail to log all API calls in its AWS account. The company must demonstrate to auditors that the CloudTrail log files have not been tampered with after they were delivered to the Amazon S3 bucket. The company wants to use a feature that automatically creates digest files containing a hash of each log file, allowing the auditor to mathematically verify the integrity of the logs. Which AWS feature should the company enable to meet this requirement?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
S3 Object Lock
S3 Object Lock prevents objects from being deleted or overwritten for a fixed retention period. While it helps with immutability, it does not generate cryptographic digest files that allow auditors to independently verify that log files have not been tampered with after delivery. The company needs a feature that provides verifiable integrity evidence, not just write-once-read-many (WORM) protection.
B
Best answer
CloudTrail log file integrity validation
CloudTrail log file integrity validation is a feature that automatically creates digest files containing the hash of each log file. These digests are signed using private keys from AWS Key Management Service (AWS KMS), enabling an auditor to verify that log files have not been altered or deleted. This feature is specifically designed for compliance scenarios that require cryptographic proof of log integrity.
C
Distractor review
AWS Config conformance packs
AWS Config conformance packs are collections of AWS Config rules and remediation actions used to evaluate whether resource configurations comply with internal policies or external regulations. They do not provide cryptographic verification of CloudTrail log files. They are used for ongoing compliance checks of resource configurations, not for post-delivery log integrity.
D
Distractor review
Amazon Detective
Amazon Detective analyzes AWS security data (e.g., VPC Flow Logs, CloudTrail logs, GuardDuty findings) to identify the root cause of potential security issues. It does not generate cryptographic digests or provide integrity verification for the log files themselves. Its purpose is investigation and analysis, not tamper-proof logging.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: CloudTrail log file integrity validation — This question tests knowledge of AWS CloudTrail’s log file integrity validation feature. This feature uses industry-standard algorithms (SHA-256 hashing and digital signatures) to create digest files. Auditors can use these digests to confirm that log files have not been modified, deleted, or altered after delivery. The feature is designed to meet regulatory and compliance requirements for log integrity. Option B is correct because it directly addresses the need for cryptographic verification of log file integrity. Option A (S3 Object Lock) prevents modification of objects but does not provide a verifiable hash chain for auditing. Option C (AWS Config conformance packs) is used to evaluate resource compliance against rules, not log integrity. Option D (Amazon Detective) analyzes security data to investigate potential issues, but does not provide cryptographic integrity validation of CloudTrail logs.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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