Understanding 'Resource Creation Cancelled' in CloudFormation — Causes and Solutions
This DOP-C02 practice question tests your understanding of sdlc 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 DevOps engineer created a CloudFormation stack that includes a Lambda function. The stack creation failed and rolled back. The error message for the Lambda function says '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.
Network Topology
A
The Lambda function's IAM role does not have sufficient permissions.
Why wrong: Would show an access denied error.
B
The Lambda function's code is missing from the S3 bucket.
Why wrong: Would show a different error like 'NoSuchKey'.
C
The stack rollback was triggered due to a failure in another resource, and the Lambda creation was cancelled.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The stack rollback was triggered due to a failure in another resource, and the Lambda creation was cancelled.
Option C is correct because CloudFormation creates resources in a specific order, and if a dependency fails or another resource fails, CloudFormation cancels the creation of subsequent resources and initiates a rollback. The error 'Resource creation cancelled' indicates that the Lambda function was never actually attempted to be created; instead, its creation was aborted due to a failure in a preceding or parallel resource. This is a standard CloudFormation behavior when a stack operation is interrupted by a failure in another resource.
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 Lambda function's IAM role does not have sufficient permissions.
Why it's wrong here
Would show an access denied error.
✗
The Lambda function's code is missing from the S3 bucket.
Why it's wrong here
Would show a different error like 'NoSuchKey'.
✓
The stack rollback was triggered due to a failure in another resource, and the Lambda creation was cancelled.
Why this is correct
The rollback cancels any in-progress creations.
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 Lambda function creation timed out.
Why it's wrong here
Would show 'timed out' in the reason.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse 'Resource creation cancelled' with a resource-specific failure (e.g., insufficient permissions), but this error indicates CloudFormation cancelled the resource due to a failure in another resource during stack creation.
Trap categories for this question
Command / output trap
Would show an access denied error.
Detailed technical explanation
How to think about this question
CloudFormation uses a dependency graph to determine resource creation order; when a resource fails, it sets the stack status to 'ROLLBACK_IN_PROGRESS' and cancels all remaining resource creations by sending a 'Resource creation cancelled' signal. This is distinct from resource-level failures, which generate specific error messages. In real-world scenarios, this often occurs when a VPC or subnet creation fails, causing all dependent resources like Lambda functions to be cancelled without ever being attempted.
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.
Quick reference
Cloud Service Model Comparison
Model
You Manage
Provider Manages
Examples
IaaS
OS, runtime, apps, data
Hardware, hypervisor, networking
EC2, Azure VMs, GCP Compute Engine
PaaS
Apps and data
OS, runtime, middleware, hardware
Elastic Beanstalk, Azure App Service
SaaS
Data and settings only
Everything else
Microsoft 365, Salesforce, Workday
FaaS / Serverless
Function code only
Infra, scaling, runtime
Lambda, Azure Functions, Cloud Run
CaaS
Containers and apps
Kubernetes, OS, hardware
EKS, AKS, GKE
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.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The stack rollback was triggered due to a failure in another resource, and the Lambda creation was cancelled. — Option C is correct because CloudFormation creates resources in a specific order, and if a dependency fails or another resource fails, CloudFormation cancels the creation of subsequent resources and initiates a rollback. The error 'Resource creation cancelled' indicates that the Lambda function was never actually attempted to be created; instead, its creation was aborted due to a failure in a preceding or parallel resource. This is a standard CloudFormation behavior when a stack operation is interrupted by a failure in another resource.
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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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. The exhibit shows a CloudFormation stack event. The stack creation failed with 'Resource creation cancelled'. What is the most likely reason for this cancellation?
easy
A.The stack template contains a syntax error.
B.The IAM role used for stack operations lacks permissions.
C.A stack creation timeout was reached.
✓ D.The stack was manually cancelled by a user or an automation script.
Why D: The 'Resource creation cancelled' event in a CloudFormation stack creation indicates that the operation was explicitly halted by a user or an automation script (e.g., via the AWS CLI, Console, or SDK). This is distinct from a timeout or permission error, which would produce different error messages such as 'Resource creation timed out' or 'API: cloudformation:CreateStack Access Denied'.
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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.
Question Discussion
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