CLF-C02 Security and Compliance Practice Question
A company manages user access to AWS resources using IAM users. The security team wants to automatically detect if an IAM user's access key is being used from a geographic location that is unusual for that user, which could indicate a compromised credential. The team needs a managed threat detection service that monitors API activity and raises alerts for such anomalies. Which AWS service should the security team use?
⚠ Common exam trap
Test-takers frequently confuse AWS CloudTrail's logging capability with active threat detection, not realizing that CloudTrail only records events and requires an additional service like GuardDuty to analyze and alert on anomalies.
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
✓
Amazon GuardDuty
Amazon GuardDuty is a managed threat detection service that continuously monitors AWS API activity, including IAM user access key usage, and uses machine learning to establish baseline behavior. When it detects access from an unusual geographic location, it generates a finding alerting the security team to a potentially compromised credential. This directly meets the requirement for automated anomaly detection without manual configuration.
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 CloudTrail
Why it's wrong here
AWS CloudTrail records all API activity in your account but does not automatically analyze the logs for anomalies or raise alerts for suspicious usage patterns. While you can enable CloudTrail Insights to detect unusual API activity, the question specifically asks for a managed threat detection service, which is not CloudTrail's primary function.
When this WOULD be correct
A company needs to audit all API calls made to AWS for compliance and forensic analysis, and requires a detailed record of who made each call, from which IP address, and when. CloudTrail would be the correct service to enable logging and monitoring of API activity.
- ✓
Amazon GuardDuty
Why this is correct
Amazon GuardDuty is the correct choice. It is a managed threat detection service that uses machine learning, anomaly detection, and threat intelligence feeds to monitor for unusual API activity, including compromised credentials and access from suspicious locations. GuardDuty raises findings that can be sent to AWS Security Hub or Amazon EventBridge for automated response.
- ✗
AWS Trusted Advisor
Why it's wrong here
AWS Trusted Advisor inspects your AWS environment and provides best practice recommendations in categories such as cost optimization, performance, security, and fault tolerance. However, it does not continuously monitor API activity or detect compromised credentials; it performs periodic checks based on static rules.
When this WOULD be correct
A company wants a service that automatically checks AWS account configurations against AWS best practices and provides recommendations to improve security, cost, performance, or fault tolerance. For example, Trusted Advisor would be correct if the question asked for a service that identifies unused IAM users or overly permissive security group rules.
- ✗
Amazon Inspector
Why it's wrong here
Amazon Inspector is an automated vulnerability management service that scans EC2 instances, container images, and Lambda functions for software vulnerabilities and network exposure. It does not analyze IAM user activity or API call patterns, so it cannot detect compromised credentials based on geographic anomalies.
When this WOULD be correct
A company wants to automatically assess EC2 instances for common vulnerabilities and exposures (CVEs) and deviations from security best practices, such as unintended network accessibility. Amazon Inspector would be the correct service for this vulnerability scanning use case.
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.
✓Amazon GuardDutyCorrect answer▾
Why this is correct
Amazon GuardDuty is the correct choice. It is a managed threat detection service that uses machine learning, anomaly detection, and threat intelligence feeds to monitor for unusual API activity, including compromised credentials and access from suspicious locations. GuardDuty raises findings that can be sent to AWS Security Hub or Amazon EventBridge for automated response.
✗AWS CloudTrailWrong answer — click to see why▾
Why this is wrong here
AWS CloudTrail records API activity but does not analyze or alert on anomalous geographic access patterns; it is a logging service, not a threat detection service.
★ When this WOULD be the correct answer
A company needs to audit all API calls made to AWS for compliance and forensic analysis, and requires a detailed record of who made each call, from which IP address, and when. CloudTrail would be the correct service to enable logging and monitoring of API activity.
Why candidates choose this
Candidates may confuse CloudTrail's logging of API calls with the ability to detect anomalies, assuming that because it records geographic information, it can also automatically alert on unusual patterns.
✗AWS Trusted AdvisorWrong answer — click to see why▾
Why this is wrong here
AWS Trusted Advisor provides best practice recommendations for cost optimization, performance, security, and fault tolerance, but it does not monitor API activity or detect anomalous geographic usage of IAM access keys.
★ When this WOULD be the correct answer
A company wants a service that automatically checks AWS account configurations against AWS best practices and provides recommendations to improve security, cost, performance, or fault tolerance. For example, Trusted Advisor would be correct if the question asked for a service that identifies unused IAM users or overly permissive security group rules.
Why candidates choose this
Candidates may confuse Trusted Advisor's security checks (like IAM key rotation or MFA recommendations) with real-time threat detection, assuming it can alert on unusual access patterns when it only provides static, periodic checks.
✗Amazon InspectorWrong answer — click to see why▾
Why this is wrong here
Amazon Inspector is a vulnerability management service that scans for software vulnerabilities and unintended network exposure, not a threat detection service that monitors API activity for anomalous geographic access patterns.
★ When this WOULD be the correct answer
A company wants to automatically assess EC2 instances for common vulnerabilities and exposures (CVEs) and deviations from security best practices, such as unintended network accessibility. Amazon Inspector would be the correct service for this vulnerability scanning use case.
Why candidates choose this
Candidates may confuse 'Inspector' with a threat detection service due to its name, or mistakenly think it monitors user behavior like GuardDuty, when it actually focuses on infrastructure vulnerabilities.
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?”
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.