Quick Answer
The answer is Amazon GuardDuty, the correct choice because it provides prebuilt anomaly detection for IAM users by leveraging machine learning to establish behavioral baselines from CloudTrail management and data events, VPC Flow Logs, and DNS logs. When an IAM user accesses services or APIs that deviate from their typical patterns—such as launching instances in an unfamiliar region or querying a database service never used before—GuardDuty automatically generates a finding without requiring any custom rules or manual configuration. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding of how GuardDuty’s integrated threat detection differs from services like AWS CloudTrail (which logs but does not analyze) or Amazon Detective (which investigates but does not prebuild anomaly detection). A common trap is confusing GuardDuty with AWS Config, but remember: Config checks compliance rules, while GuardDuty spots behavioral outliers. Memory tip: think “GuardDuty guards the duty of IAM users by learning their normal habits.”
This SCS-C02 practice question tests your understanding of security logging and monitoring. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 user behavior, such as accessing services that are not typically used. Which AWS service provides prebuilt anomaly detection for IAM users?
AWS Trusted Advisor
Why wrong: Trusted Advisor provides checks but not real-time anomaly detection.
AWS CloudTrail
Why wrong: CloudTrail records events but does not analyze for anomalies.
Amazon GuardDuty
GuardDuty uses ML to detect anomalous IAM user behavior.
Amazon Inspector
Why wrong: Inspector assesses EC2 instances for vulnerabilities, not IAM behavior.
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 answer because it is a threat detection service that uses machine learning and anomaly detection to identify suspicious IAM user behavior, such as accessing services not typically used. It analyzes AWS CloudTrail management and data events, VPC Flow Logs, and DNS logs to establish baselines and generate findings for unusual API calls or access patterns. This prebuilt capability directly addresses the requirement for detecting atypical IAM activity without manual configuration.
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 provides checks but not real-time anomaly detection.
AWS CloudTrail
Why it's wrong here
CloudTrail records events but does not analyze for anomalies.
Amazon GuardDuty
Why this is correct
GuardDuty uses ML to detect anomalous IAM user behavior.
Related concept
Read the scenario before looking for a memorised answer.
Amazon Inspector
Why it's wrong here
Inspector assesses EC2 instances for vulnerabilities, not IAM behavior.
Common exam traps
The trap here is that candidates often confuse AWS CloudTrail's logging capability with active threat detection, assuming that because CloudTrail records API calls, it can also detect anomalies, but it lacks the machine learning engine required for prebuilt anomaly detection.
Detailed technical explanation
GuardDuty's anomaly detection for IAM users relies on a machine learning model that profiles normal behavior patterns, such as typical access times, source IP addresses, and services used, over a rolling baseline period. When a user suddenly accesses a service like Amazon DynamoDB from an unusual geographic region or at an atypical hour, GuardDuty generates a finding (e.g., 'UnauthorizedAccess:IAMUser/InstanceCredentialExfiltration') with severity levels. In a real-world scenario, this could detect a compromised IAM user whose credentials are used to launch EC2 instances in an unfamiliar region, triggering an automated response via Amazon EventBridge.
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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Security Logging and Monitoring — study guide chapter
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FAQ
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon GuardDuty — Amazon GuardDuty is the correct answer because it is a threat detection service that uses machine learning and anomaly detection to identify suspicious IAM user behavior, such as accessing services not typically used. It analyzes AWS CloudTrail management and data events, VPC Flow Logs, and DNS logs to establish baselines and generate findings for unusual API calls or access patterns. This prebuilt capability directly addresses the requirement for detecting atypical IAM activity without manual configuration.
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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