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 security engineer is investigating a potential compromise of an IAM user. The engineer sees that the user's access keys were used from an IP address outside the company's allowed geography. Which AWS service can provide the most immediate notification of such anomalous API calls?
AWS Trusted Advisor
Why wrong: Trusted Advisor is for best practices, not real-time alerts.
Amazon GuardDuty
GuardDuty detects anomalous API calls and generates findings.
AWS CloudTrail
Why wrong: CloudTrail logs but does not alert.
Amazon CloudWatch
Why wrong: Can alert but requires custom setup.
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 a threat detection service that continuously monitors for malicious or unauthorized behavior, including anomalous API calls from unusual geographies. It uses machine learning and integrated threat intelligence to analyze CloudTrail events, VPC flow logs, and DNS logs in near real-time, enabling immediate notification of suspicious activity such as access key usage from an unexpected IP address.
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 Trusted Advisor
Why it's wrong here
Trusted Advisor is for best practices, not real-time alerts.
Amazon GuardDuty
Why this is correct
GuardDuty detects anomalous API calls and generates findings.
Related concept
Read the scenario before looking for a memorised answer.
AWS CloudTrail
Why it's wrong here
CloudTrail logs but does not alert.
Amazon CloudWatch
Why it's wrong here
Can alert but requires custom setup.
Common exam traps
The trap here is that candidates often confuse AWS CloudTrail's logging capability with active threat detection, forgetting that CloudTrail only records events and requires an additional service like GuardDuty or a custom CloudWatch alarm to provide immediate notification of anomalous activity.
Detailed technical explanation
GuardDuty's anomaly detection for geolocation is powered by a machine learning model that establishes a baseline of normal API call patterns for each IAM user, including typical source IP ranges and geographic regions. When an access key is used from an IP address outside the expected geography, GuardDuty generates a finding (e.g., 'UnauthorizedAccess:IAMUser/AnomalousActivity') within minutes, leveraging the GeoIP database from MaxMind to map IP addresses to countries. In a real-world scenario, this immediate notification allows the security engineer to revoke the compromised keys before the attacker escalates privileges or exfiltrates data.
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 a threat detection service that continuously monitors for malicious or unauthorized behavior, including anomalous API calls from unusual geographies. It uses machine learning and integrated threat intelligence to analyze CloudTrail events, VPC flow logs, and DNS logs in near real-time, enabling immediate notification of suspicious activity such as access key usage from an unexpected IP address.
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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