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Security and Compliance →mediumMultiple ChoiceObjective-mapped

CLF-C02 Security and Compliance Practice Question

This CLF-C02 practice question tests your understanding of security and compliance. 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.

Which AWS service helps detect unusual API activity and potential security threats by analyzing AWS CloudTrail, VPC Flow Logs, and DNS logs?

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 threat detection service that uses machine learning, anomaly detection, and integrated threat intelligence to identify malicious activity. It analyzes data sources including AWS CloudTrail management and data events, VPC Flow Logs, and DNS logs to detect unusual API calls, potentially compromised instances, and other security threats.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 Security Hub

    Why it's wrong here

    Security Hub aggregates findings from multiple services; GuardDuty is the detection engine.

  • ✗

    Amazon Macie

    Why it's wrong here

    Macie detects sensitive data in S3; GuardDuty detects threats via log analysis.

  • ✓

    Amazon GuardDuty

    Why this is correct

    GuardDuty uses ML to analyze CloudTrail, VPC Flow Logs, and DNS logs to detect threats.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    AWS CloudTrail

    Why it's wrong here

    CloudTrail records API calls; GuardDuty analyzes those logs to detect threats.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse AWS CloudTrail (the logging service) with GuardDuty (the threat detection service), assuming that simply enabling CloudTrail provides threat detection, when in fact CloudTrail only records events and requires a separate analysis engine like GuardDuty to identify malicious patterns.

Detailed technical explanation

How to think about this question

GuardDuty operates by ingesting and analyzing three primary data sources: CloudTrail management events (e.g., IAM user activity), VPC Flow Logs (network traffic metadata), and DNS query logs (domain resolution requests). It uses a combination of rule-based detection (e.g., known malicious IP addresses from threat intelligence feeds) and machine learning models to establish baselines of normal behavior and flag anomalies, such as an EC2 instance communicating with a known command-and-control server or an unusual volume of failed API calls.

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.

TExam Day Tips

  • 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.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this CLF-C02 question test?

Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Amazon GuardDuty — Amazon GuardDuty is a threat detection service that uses machine learning, anomaly detection, and integrated threat intelligence to identify malicious activity. It analyzes data sources including AWS CloudTrail management and data events, VPC Flow Logs, and DNS logs to detect unusual API calls, potentially compromised instances, and other security threats.

What should I do if I get this CLF-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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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.