This SCS-C02 practice question tests your understanding of threat detection and incident response. 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 wants to detect and alert on suspicious IAM role usage, such as a role being assumed from an unusual geographic location. Which AWS service should be used to generate the alerts?
AWS IAM Access Analyzer
Why wrong: Access Analyzer identifies resources shared with external entities.
Amazon GuardDuty
GuardDuty uses anomaly detection on CloudTrail events to alert on unusual activity.
AWS CloudTrail
Why wrong: CloudTrail records events but does not generate alerts.
Amazon CloudWatch
Why wrong: CloudWatch can alert on metrics but requires custom configuration.
Answer choices
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 the correct choice because it is a threat detection service that continuously monitors for suspicious activity, including unusual IAM role usage such as a role being assumed from an anomalous geographic location. It uses machine learning, anomaly detection, and integrated threat intelligence to analyze CloudTrail management events and VPC flow logs, generating alerts (findings) for deviations from baseline behavior. This directly meets the requirement to detect and alert on suspicious role assumptions without needing to write custom rules.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS IAM Access Analyzer
Why it's wrong here
Access Analyzer identifies resources shared with external entities.
Amazon GuardDuty
Why this is correct
GuardDuty uses anomaly detection on CloudTrail events to alert on unusual activity.
Related concept
Read the scenario before looking for a memorised answer.
AWS CloudTrail
Why it's wrong here
CloudTrail records events but does not generate alerts.
Amazon CloudWatch
Why it's wrong here
CloudWatch can alert on metrics but requires custom configuration.
Common exam traps
The trap here is that candidates often confuse AWS CloudTrail's logging capability with detection, assuming that because CloudTrail records the AssumeRole event, it can also alert on it, but CloudTrail requires an additional service like GuardDuty or CloudWatch with custom rules to generate alerts, whereas GuardDuty provides built-in, automated anomaly detection for this exact scenario.
Detailed technical explanation
GuardDuty detects unusual IAM role usage by analyzing CloudTrail management events, specifically the AssumeRole API call, and comparing the source IP address's geolocation against the role's historical usage patterns. Under the hood, GuardDuty uses a combination of rule-based detection (e.g., known malicious IPs from threat intelligence feeds) and machine learning models that establish a baseline of normal role usage per account, triggering a finding like 'UnauthorizedAccess:IAMUser/InstanceCredentialExfiltration' or 'Policy:IAMUser/RoleAssumptionFromUnusualLocation' when deviations occur. In a real-world scenario, if an attacker exfiltrates temporary credentials from an EC2 instance and assumes a role from a different continent, GuardDuty would generate an alert within minutes, whereas CloudTrail alone would only log the event without any notification.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon GuardDuty — Amazon GuardDuty is the correct choice because it is a threat detection service that continuously monitors for suspicious activity, including unusual IAM role usage such as a role being assumed from an anomalous geographic location. It uses machine learning, anomaly detection, and integrated threat intelligence to analyze CloudTrail management events and VPC flow logs, generating alerts (findings) for deviations from baseline behavior. This directly meets the requirement to detect and alert on suspicious role assumptions without needing to write custom rules.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This SCS-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 SCS-C02 exam.
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