SCS-C02 Threat Detection and Incident Response Practice Question
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 company uses AWS CloudTrail to log all API calls. The security team notices a series of `UpdateTrail` API calls from a user in the Security account, disabling logging on a multi-region trail. The user has a policy that allows `cloudtrail:UpdateTrail` only on trails with a specific tag. However, the trail does not have that tag. What is the MOST likely reason the call succeeded?
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 trail did not have the required tag at the time of the API call due to a race condition.
Option A is correct because AWS IAM policies are evaluated based on the resource's tags at the time of the API call. If the `UpdateTrail` API call was made while the trail's tag was being removed or added, a race condition could cause the trail to temporarily lack the required tag, allowing the action to succeed despite the policy's intent. This is a known edge case in IAM tag-based authorization, where eventual consistency of tag changes can lead to unintended access.
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 trail did not have the required tag at the time of the API call due to a race condition.
Why this is correct
If the tag condition was not met, the call should have failed unless the user had other permissions.
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 trail had an explicit deny in the same policy that was overridden by a separate allow.
Why it's wrong here
Explicit deny always overrides allow.
✗
The user's permissions were granted through a service control policy (SCP) that allowed the action.
Why it's wrong here
SCPs set boundaries but do not grant; the user still needs an IAM allow.
✗
CloudTrail API calls are not logged and bypass IAM policies.
Why it's wrong here
CloudTrail API calls are subject to IAM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume IAM tag-based conditions are strictly enforced in real-time, but AWS's eventual consistency model can create race conditions that allow actions to succeed even when tags are not present at the exact moment of the API call.
Detailed technical explanation
How to think about this question
IAM tag-based conditions use the `aws:ResourceTag` key, which is evaluated against the resource's current tags at the time of the request. However, tag changes are eventually consistent across AWS services, meaning a tag removal might not be immediately reflected in IAM's authorization cache. This can create a window where a trail that had the tag removed still appears to have it, or vice versa, leading to race conditions. In practice, this is a common pitfall when automating tag-based access control with scripts or infrastructure-as-code.
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.
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 trail did not have the required tag at the time of the API call due to a race condition. — Option A is correct because AWS IAM policies are evaluated based on the resource's tags at the time of the API call. If the `UpdateTrail` API call was made while the trail's tag was being removed or added, a race condition could cause the trail to temporarily lack the required tag, allowing the action to succeed despite the policy's intent. This is a known edge case in IAM tag-based authorization, where eventual consistency of tag changes can lead to unintended access.
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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