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Question 407 of 1,750

Configuration Management and IaC →mediumMultiple ChoiceObjective-mapped

DOP-C02 Configuration Management and IaC Practice Question

This DOP-C02 practice question tests your understanding of configuration management and iac. 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 DevOps engineer is troubleshooting a CloudFormation stack creation failure. The stack includes an EC2 instance with a UserData script that installs software. The stack creation fails with the error: 'The following resource(s) failed: EC2Instance (AWS::EC2::Instance) – Resource creation cancelled'. What is the most likely cause?

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 EC2 instance type is not supported in the region
Why wrong: Unsupported instance type would cause a different error.
B
The IAM role attached to the instance lacks permissions
Why wrong: Permission issues would cause an AccessDenied error.
C
The stack creation timed out or was manually cancelled
Resource creation cancelled typically indicates a timeout or manual cancellation.
D
The UserData script failed due to a syntax error
Why wrong: UserData failure does not cause CloudFormation to cancel the resource creation; it only logs errors.

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 stack creation timed out or was manually cancelled

The error message 'Resource creation cancelled' indicates that the CloudFormation stack creation was either timed out or manually cancelled, not that the EC2 instance itself failed. CloudFormation has a default timeout of 60 minutes for stack creation, and if the UserData script takes longer than this or the user manually cancels the operation, CloudFormation will mark the resource as cancelled. This is distinct from a resource-specific failure like an invalid instance type or IAM permissions issue, which would produce a different error message such as 'Resource failed to stabilize' or 'API error'.

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 EC2 instance type is not supported in the region
Why it's wrong here
Unsupported instance type would cause a different error.
✗
The IAM role attached to the instance lacks permissions
Why it's wrong here
Permission issues would cause an AccessDenied error.
✓
The stack creation timed out or was manually cancelled
Why this is correct
Resource creation cancelled typically indicates a timeout or manual cancellation.
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 UserData script failed due to a syntax error
Why it's wrong here
UserData failure does not cause CloudFormation to cancel the resource creation; it only logs errors.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse a UserData script failure with a resource creation failure, but CloudFormation does not monitor UserData execution; it only tracks the EC2 instance's state transition to 'running', so a script error would not cause a cancellation error.

Detailed technical explanation

How to think about this question

CloudFormation uses a 'CREATE_IN_PROGRESS' state for resources and waits for a 'CREATE_COMPLETE' signal. If the stack creation times out (default 60 minutes) or is manually cancelled via the AWS Console, CLI, or API, CloudFormation transitions the resource to 'CREATE_FAILED' with the 'Resource creation cancelled' reason. This is different from a 'Resource failed to stabilize' error, which occurs when the EC2 instance fails to reach a running state within the expected time (usually 10-15 minutes). The cancellation can also happen if a dependent resource fails and the stack is configured with a rollback trigger, causing all in-progress resources to be cancelled.

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 DOP-C02 question test?

Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The stack creation timed out or was manually cancelled — The error message 'Resource creation cancelled' indicates that the CloudFormation stack creation was either timed out or manually cancelled, not that the EC2 instance itself failed. CloudFormation has a default timeout of 60 minutes for stack creation, and if the UserData script takes longer than this or the user manually cancels the operation, CloudFormation will mark the resource as cancelled. This is distinct from a resource-specific failure like an invalid instance type or IAM permissions issue, which would produce a different error message such as 'Resource failed to stabilize' or 'API error'.

What should I do if I get this DOP-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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This DOP-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 DOP-C02 exam.