The correct answer is that the nested stack creation was cancelled due to a timeout. When a parent CloudFormation stack shows a CREATE_FAILED status with the reason “Resource creation cancelled,” it directly points to the nested stack being terminated before it could complete, most often because it exceeded its specified creation timeout or was manually interrupted. This scenario tests your understanding of how CloudFormation handles nested stacks as atomic resources—the parent stack treats the nested stack as a single resource, and if that resource fails or is cancelled, the entire parent creation rolls back. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept frequently appears in troubleshooting questions where you must distinguish between a timeout, a user-initiated cancellation, or an IAM permissions error. A common trap is assuming a “cancelled” event always means a user hit the cancel button, but in nested stacks, it typically signals a timeout. Memory tip: think of a nested stack as a “subcontractor” that gets fired if it takes too long—the parent doesn’t wait forever.
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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.
Network Topology
Refer to the exhibit. A SysOps administrator ran the describe-stack-events command for a CloudFormation stack named 'my-stack'. The stack creation failed with 'Resource creation cancelled'. 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 nested stack creation timed out and was cancelled.
The correct answer is C because the nested stack creation was cancelled, likely due to a timeout or user interruption. The parent stack shows CREATE_FAILED with reason 'Resource creation cancelled', and the nested stack is in CREATE_IN_PROGRESS. This indicates that the nested stack was cancelled, possibly because it exceeded a timeout. Option A is incorrect because the event shows the nested stack is in progress, not failed. Option B is incorrect because there is no explicit cancellation event from the user. Option D is incorrect because there is no evidence of an IAM permission issue.
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 stack creation was manually cancelled by the administrator.
Why it's wrong here
There is no event indicating manual cancellation.
✗
The IAM role for the stack does not have sufficient permissions.
Why it's wrong here
Permission issues would show ACCESS_DENIED, not cancellation.
✗
The nested stack creation failed due to an invalid template.
Why it's wrong here
The nested stack status is CREATE_IN_PROGRESS, not FAILED.
✓
The nested stack creation timed out and was cancelled.
Why this is correct
The 'Resource creation cancelled' error often occurs when a nested stack times out.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Permission issues would show ACCESS_DENIED, not cancellation.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The nested stack creation timed out and was cancelled. — The correct answer is C because the nested stack creation was cancelled, likely due to a timeout or user interruption. The parent stack shows CREATE_FAILED with reason 'Resource creation cancelled', and the nested stack is in CREATE_IN_PROGRESS. This indicates that the nested stack was cancelled, possibly because it exceeded a timeout. Option A is incorrect because the event shows the nested stack is in progress, not failed. Option B is incorrect because there is no explicit cancellation event from the user. Option D is incorrect because there is no evidence of an IAM permission issue.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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