Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company's security team needs to investigate a potential security incident. They want to determine which IAM user launched a new, unauthorized Amazon EC2 instance two days ago. The team needs to see the exact timestamp, the source IP address, and the instance type that was launched. Which AWS service should the security team use to find this information?
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
AWS Config
AWS Config evaluates resource configurations against desired policies and records configuration changes, but it does not record the identity of the user who made the change. Therefore, it cannot provide the specific IAM user who launched the instance.
B
Best answer
AWS CloudTrail
AWS CloudTrail records all API calls, including the caller identity, timestamp, source IP address, and request parameters. This enables the security team to determine which IAM user launched the EC2 instance, when, and from where.
C
Distractor review
Amazon GuardDuty
Amazon GuardDuty is a continuous security monitoring service that detects threats such as unusual API activity or compromised instances. However, it does not provide a comprehensive audit log of all API calls with caller identity and timestamps for historical investigation.
D
Distractor review
AWS Trusted Advisor
AWS Trusted Advisor inspects your AWS environment and provides best-practice recommendations in areas like cost, performance, security, and fault tolerance. It does not log or track API calls, so it cannot show who launched a specific instance.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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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?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: AWS CloudTrail — AWS CloudTrail records all API calls made in an AWS account, including the identity of the caller, the time of the call, the source IP address, and the request parameters. This makes it the correct service to identify who launched the EC2 instance and when. AWS Config records configuration changes to resources but does not capture the identity of the user who made the change. Amazon GuardDuty is a threat detection service that monitors for malicious activity but does not provide a detailed audit trail of user actions. AWS Trusted Advisor provides recommendations for cost optimization, performance, security, and fault tolerance, but it does not log API calls.
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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