The answer is that the Lambda function deployment package exceeds the maximum allowed size for Lambda. This is correct because AWS CloudFormation enforces the same hard limits as the Lambda service itself: 50 MB for a zipped direct upload and 250 MB for container images, and any stack update that attempts to deploy a package beyond these thresholds will fail with an explicit code size error. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how CodePipeline integrates with CloudFormation to enforce service quotas during the deploy stage, often appearing as a trap where candidates mistakenly blame IAM permissions or S3 bucket configurations. A common memory tip is to remember the "50/250 rule": if your zipped code is over 50 MB, you must either trim dependencies or switch to a container image to stay under the 250 MB limit.
DOP-C02 SDLC Automation Practice Question
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.
A DevOps engineer notices that a CodePipeline execution fails at the deploy stage when deploying a Lambda function using AWS CloudFormation. The error message indicates that the stack update failed because the Lambda function's code is too large. 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 function deployment package exceeds the maximum allowed size for Lambda.
The error message explicitly states that the Lambda function's code is too large, which directly points to the Lambda deployment package exceeding the maximum allowed size. AWS Lambda has a hard limit of 50 MB for zipped direct uploads (or 250 MB for container images), and CloudFormation will fail the stack update if the package exceeds this limit during a deploy stage.
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 IAM role used by CloudFormation does not have sufficient permissions to update the Lambda function.
Why it's wrong here
Permissions issues would cause access denied errors, not size-related errors.
✗
The CloudFormation template exceeds the maximum size limit for templates.
Why it's wrong here
CloudFormation template size limit is separate and typically not the issue.
✗
The artifact stored in the pipeline's S3 bucket exceeds the maximum allowed size for CodePipeline artifacts.
Why it's wrong here
CodePipeline does not have a strict artifact size limit.
✓
The Lambda function deployment package exceeds the maximum allowed size for Lambda.
Why this is correct
Lambda has a size limit for deployment packages.
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
The trap here is that candidates may confuse CodePipeline artifact size limits (which are much larger) with Lambda deployment package size limits, or incorrectly attribute the failure to CloudFormation template size limits or IAM permissions, when the error message directly indicates the Lambda code size is the issue.
Detailed technical explanation
How to think about this question
AWS Lambda enforces a 50 MB limit for zipped deployment packages uploaded directly via the API or console, and a 250 MB limit for container images (uncompressed). When using CloudFormation to deploy a Lambda function, the template references the S3 bucket location of the deployment package; if the package exceeds the limit, CloudFormation receives a ValidationException from the Lambda service. In real-world scenarios, this often occurs when developers bundle large dependencies (e.g., machine learning libraries or native binaries) without using Lambda layers or container images to stay within the limit.
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.
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 Lambda function deployment package exceeds the maximum allowed size for Lambda. — The error message explicitly states that the Lambda function's code is too large, which directly points to the Lambda deployment package exceeding the maximum allowed size. AWS Lambda has a hard limit of 50 MB for zipped direct uploads (or 250 MB for container images), and CloudFormation will fail the stack update if the package exceeds this limit during a deploy stage.
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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Question Discussion
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