The answer is the user lacks the `iam:PassRole` permission for the CloudTrail service role. Even though the user has `cloudtrail:CreateTrail` and `cloudtrail:StartLogging` actions, starting logging requires passing a service role to CloudTrail so it can assume that role to write logs to S3 and deliver them to CloudWatch Logs. Without `iam:PassRole` scoped to the correct role ARN, the `StartLogging` API call fails silently. On the AWS Certified Security Specialty SCS-C02 exam, this tests your understanding that creating a trail and enabling logging are separate permission domains—a classic trap where examinees see `StartLogging` allowed and assume the action will work. The key insight is that CloudTrail must assume a role to perform its delivery tasks, and `iam:PassRole` is the gatekeeper for that assumption. Memory tip: "Create the trail, but you can't Pass the role—logging hits a wall."
SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 finds this IAM policy attached to a user. The user is able to create CloudTrail trails but cannot start logging. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user lacks `iam:PassRole` permission for the CloudTrail service role.
The user can create CloudTrail trails but cannot start logging because starting logging requires the `iam:PassRole` permission to pass the CloudTrail service role to the CloudTrail service. Without this permission, CloudTrail cannot assume the role needed to write logs to the S3 bucket and deliver them to CloudWatch Logs, even though the user has `cloudtrail:CreateTrail` and `cloudtrail:StartLogging` actions in the policy.
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 user lacks `iam:PassRole` permission for the CloudTrail service role.
Why this is correct
Starting logging requires passing an IAM role to CloudTrail.
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 `StartLogging` action is not listed in the policy.
Why it's wrong here
It is listed.
✗
The policy does not specify the `cloudtrail:StartLogging` action.
Why it's wrong here
It is specified.
✗
The user does not have permission to create CloudTrail trails.
Why it's wrong here
The policy allows `CreateTrail`.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on the missing `cloudtrail:StartLogging` action in the policy, but the real issue is the missing `iam:PassRole` permission, which is a common oversight when configuring CloudTrail permissions.
Detailed technical explanation
How to think about this question
When CloudTrail starts logging, it uses a service-linked role or a user-provided role to assume permissions for writing to S3 and CloudWatch Logs. The `iam:PassRole` permission is required to allow the CloudTrail service to assume that role, and it must be explicitly granted on the role ARN. Without it, the `StartLogging` API call fails with an access denied error, even though the user has the `cloudtrail:StartLogging` action allowed.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user lacks `iam:PassRole` permission for the CloudTrail service role. — The user can create CloudTrail trails but cannot start logging because starting logging requires the `iam:PassRole` permission to pass the CloudTrail service role to the CloudTrail service. Without this permission, CloudTrail cannot assume the role needed to write logs to the S3 bucket and deliver them to CloudWatch Logs, even though the user has `cloudtrail:CreateTrail` and `cloudtrail:StartLogging` actions in the policy.
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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Question Discussion
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