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Question 788 of 1,748

Security Logging and Monitoring →hardMultiple ChoiceObjective-mapped

SCS-C02 Security Logging and Monitoring Practice Question

This SCS-C02 practice question tests your understanding of security logging and monitoring. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 is using Amazon GuardDuty to detect threats. The security team notices that GuardDuty findings are not triggering the intended automated response via a CloudWatch Events rule. What is the most likely reason?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The CloudWatch Events rule's event pattern does not match the GuardDuty finding event structure.
The event pattern must specify 'source': ['aws.guardduty'] and 'detail-type': ['GuardDuty Finding'] to match.
B
The GuardDuty detector is in a different region than the CloudWatch Events rule.
Why wrong: GuardDuty findings are regional; if the rule is in the same region, this is not an issue.
C
The Lambda function invoked by CloudWatch Events does not have an IAM role assigned.
Why wrong: Lambda role is needed for execution, but CloudWatch Events can still trigger the function; the function would fail but the event rule would still match.
D
VPC Flow Logs are not enabled.
Why wrong: GuardDuty uses multiple data sources including VPC Flow Logs, but findings can still be generated without them, and this does not affect event triggering.

Full breakdown with real-world context →

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

✓

The CloudWatch Events rule's event pattern does not match the GuardDuty finding event structure.

GuardDuty findings are sent to CloudWatch Events as events with a specific structure, including fields like 'detail-type' set to 'GuardDuty Finding' and 'source' set to 'aws.guardduty'. If the CloudWatch Events rule's event pattern does not match this exact structure—for example, if it filters on the wrong 'source' or 'detail-type'—the rule will not trigger the intended automated response. This is the most common reason for the described failure.

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.

✓
The CloudWatch Events rule's event pattern does not match the GuardDuty finding event structure.
Why this is correct
The event pattern must specify 'source': ['aws.guardduty'] and 'detail-type': ['GuardDuty Finding'] to match.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The GuardDuty detector is in a different region than the CloudWatch Events rule.
Why it's wrong here
GuardDuty findings are regional; if the rule is in the same region, this is not an issue.
✗
The Lambda function invoked by CloudWatch Events does not have an IAM role assigned.
Why it's wrong here
Lambda role is needed for execution, but CloudWatch Events can still trigger the function; the function would fail but the event rule would still match.
✗
VPC Flow Logs are not enabled.
Why it's wrong here
GuardDuty uses multiple data sources including VPC Flow Logs, but findings can still be generated without them, and this does not affect event triggering.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume the issue is with permissions (Lambda role) or prerequisites (VPC Flow Logs), but the core problem is almost always a mismatch in the event pattern structure, which is a fundamental CloudWatch Events concept.

Detailed technical explanation

How to think about this question

GuardDuty sends findings as events to the default event bus in CloudWatch Events with a specific structure: the 'source' key is 'aws.guardduty', the 'detail-type' is 'GuardDuty Finding', and the 'detail' object contains the finding JSON. The event pattern in the CloudWatch Events rule must use exact matching or prefix matching on these fields; for example, a pattern like {"source": ["aws.guardduty"]} is required. A common misconfiguration is using a pattern that matches a different service's events or omitting the 'detail-type' filter, causing the rule to ignore GuardDuty findings.

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 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

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 SCS-C02 question test?

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

What is the correct answer to this question?

The correct answer is: The CloudWatch Events rule's event pattern does not match the GuardDuty finding event structure. — GuardDuty findings are sent to CloudWatch Events as events with a specific structure, including fields like 'detail-type' set to 'GuardDuty Finding' and 'source' set to 'aws.guardduty'. If the CloudWatch Events rule's event pattern does not match this exact structure—for example, if it filters on the wrong 'source' or 'detail-type'—the rule will not trigger the intended automated response. This is the most common reason for the described failure.

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

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

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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