The answer is that the Lambda function execution time exceeds the maximum timeout limit. AWS Lambda enforces a hard cap of 15 minutes for any single invocation, so if your post-processing logic—such as transforming large SageMaker outputs or running complex calculations—takes longer than that, the function will fail with a timeout error regardless of how well the preceding training job performed. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of Lambda’s service limits within a Step Functions workflow, often appearing as a distractor where candidates mistakenly blame the orchestration layer or permissions. A common trap is assuming Step Functions itself imposes a timeout, but the real culprit is Lambda’s 900-second ceiling. Memory tip: think “15-minute wall”—if your post-processing can’t finish before that, you need to refactor into a longer-running service like AWS Batch or Fargate.
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. 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 machine learning engineer is using AWS Step Functions to orchestrate a SageMaker training job followed by a Lambda function for post-processing. The training job completes successfully, but the Lambda function fails with a timeout error. 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 execution time exceeds the maximum timeout limit
Lambda has a maximum execution timeout of 15 minutes. If post-processing takes longer, it will timeout. Option A is correct. Option B is wrong because the training job completed successfully. Option C is wrong because Step Functions itself is not the cause. Option D is wrong because the failure is a timeout, not a 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 Lambda function's IAM role lacks permissions to access the training output
Why it's wrong here
That would cause an access error, not timeout.
✓
The Lambda function execution time exceeds the maximum timeout limit
Why this is correct
Lambda timeout is 15 minutes max.
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 Step Functions state machine has a misconfigured retry policy
Why it's wrong here
Retry policy would not cause a timeout.
✗
The SageMaker training job output data is too large for Lambda to process
Why it's wrong here
Lambda can process large data via streaming.
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 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 MLS-C01 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.
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Lambda function execution time exceeds the maximum timeout limit — Lambda has a maximum execution timeout of 15 minutes. If post-processing takes longer, it will timeout. Option A is correct. Option B is wrong because the training job completed successfully. Option C is wrong because Step Functions itself is not the cause. Option D is wrong because the failure is a timeout, not a permission issue.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 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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