The answer is a custom training script error, because the SageMaker training job failure reason explicitly shows ExitCode 1 from UserScript, which is the standard Linux exit code for a general script error. When a training container exits with code 1, it means the user-provided code encountered an unhandled exception, syntax error, or runtime failure—not an infrastructure or permission issue. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your ability to interpret SageMaker CloudWatch logs and failure reasons, distinguishing between script errors (ExitCode 1), memory exhaustion (OutOfMemory), S3 access problems (AccessDenied), and instance limit breaches (ResourceLimitExceeded). A common trap is assuming any failure is resource-related, but ExitCode 1 always points back to your code. Memory tip: “ExitCode 1 = Script’s the one”—if you see that code, debug your training script first, not the environment.
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.
Network Topology
A SageMaker training job fails with the failure reason shown in the exhibit. 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
✓
There is an error in the custom training script
Option B is correct: ExitCode 1 from UserScript indicates an error in the training script. Option A (insufficient memory) would show OutOfMemory error. Option C (S3 access) would show AccessDenied. Option D (instance limit) would show ResourceLimitExceeded.
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 training instance ran out of memory
Why it's wrong here
OutOfMemory would have a different error message.
✗
The S3 bucket with training data is not accessible
Why it's wrong here
S3 access errors show AccessDenied, not ExitCode.
✗
The SageMaker service limit for the instance type has been exceeded
Why it's wrong here
Limit exceeded gives ResourceLimitExceeded error.
✓
There is an error in the custom training script
Why this is correct
ExecuteUserScriptError with ExitCode 1 indicates script error.
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
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.
Trap categories for this question
Command / output trap
S3 access errors show AccessDenied, not ExitCode.
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 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: There is an error in the custom training script — Option B is correct: ExitCode 1 from UserScript indicates an error in the training script. Option A (insufficient memory) would show OutOfMemory error. Option C (S3 access) would show AccessDenied. Option D (instance limit) would show ResourceLimitExceeded.
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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