The correct answer is that the Lambda deployment package is very large, causing the S3 download to exceed the resource creation timeout. This occurs because CloudFormation imposes a hard limit on the time allowed for resource creation—typically 30 minutes for Lambda functions—and a large ZIP file stored in S3 can take too long to download and unpack, especially if the network latency or S3 transfer speed is suboptimal. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of the distinction between resource creation timeouts and function execution timeouts, a common trap where candidates confuse the Lambda function’s own timeout setting (which governs runtime) with the CloudFormation resource creation timeout. Remember that CloudFormation’s timeout applies to the entire provisioning step, not the code’s execution. A useful memory tip: “Creation timeout is about the download, not the run.”
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 an AWS CloudFormation stack that failed to create. The error message indicates that a resource 'AWS::Lambda::Function' timed out while being created. The Lambda function code is packaged as a ZIP file in Amazon S3. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Lambda deployment package is very large, causing the S3 download to exceed the resource creation timeout.
Option C is correct because Lambda function creation can time out if the deployment package is very large and the S3 download takes too long. Option A is wrong because execution role permissions cause access denied errors, not timeouts. Option B is wrong because the Lambda function's timeout setting is for execution, not creation. Option D is wrong because CloudFormation service role permissions affect the stack operations but not the resource creation timeout specifically.
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 has a very short timeout (e.g., 3 seconds) configured in the function properties.
Why it's wrong here
The timeout is for function execution, not creation.
✗
The Lambda function's execution role does not have permission to download the ZIP file from S3.
Why it's wrong here
This would cause an access denied error, not a timeout.
✓
The Lambda deployment package is very large, causing the S3 download to exceed the resource creation timeout.
Why this is correct
Large packages can cause timeouts during creation.
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 CloudFormation service role does not have permissions to create Lambda functions.
Why it's wrong here
This would cause an access denied error.
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.
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 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 DOP-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.
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 Lambda deployment package is very large, causing the S3 download to exceed the resource creation timeout. — Option C is correct because Lambda function creation can time out if the deployment package is very large and the S3 download takes too long. Option A is wrong because execution role permissions cause access denied errors, not timeouts. Option B is wrong because the Lambda function's timeout setting is for execution, not creation. Option D is wrong because CloudFormation service role permissions affect the stack operations but not the resource creation timeout specifically.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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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