This MLS-C01 practice question tests your understanding of modeling. 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.
An IAM policy attached to a SageMaker execution role is shown. A training job executed with this role fails with an error that the role cannot access the S3 bucket. The training job uses input data from s3://my-bucket/train/data.csv and output to s3://my-bucket/output/. 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 training job does not have s3:PutObject permission for the output location
Option C is correct because the error message indicates the role cannot access the S3 bucket, which typically occurs when the role lacks write permissions to the output location. The training job needs s3:PutObject permission to write the output artifacts (model, logs, etc.) to s3://my-bucket/output/. Without this permission, SageMaker fails to save the training results, resulting in an access error.
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 job does not have s3:GetObject permission for the input data
Why it's wrong here
The policy allows s3:GetObject on train/*, which includes the input data.
✗
The training data is encrypted with SSE-KMS and the role lacks KMS permissions
Why it's wrong here
No KMS permissions are in the policy, but the error is about S3 access, not KMS.
✓
The training job does not have s3:PutObject permission for the output location
Why this is correct
The output path 'output/' is not covered by the resource 'train/*', so PutObject fails.
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 S3 bucket is in a different region than the training job
Why it's wrong here
Region mismatch could cause errors, but the policy is the more direct issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between read and write permissions in SageMaker S3 access, and the trap here is that candidates assume the error is about reading input data (Option A) when the actual failure is due to missing write permissions for the output location (Option C).
Detailed technical explanation
How to think about this question
SageMaker training jobs require both s3:GetObject and s3:PutObject permissions on the S3 bucket for input and output respectively. The IAM role must have a policy that explicitly allows these actions on the bucket ARN (e.g., arn:aws:s3:::my-bucket/*). A common pitfall is that the error message 'cannot access the S3 bucket' is ambiguous and often misleads candidates into thinking it's a read permission issue, but in practice, write permission failures are more frequent because output paths are created dynamically during training.
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.
Modeling — This question tests Modeling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The training job does not have s3:PutObject permission for the output location — Option C is correct because the error message indicates the role cannot access the S3 bucket, which typically occurs when the role lacks write permissions to the output location. The training job needs s3:PutObject permission to write the output artifacts (model, logs, etc.) to s3://my-bucket/output/. Without this permission, SageMaker fails to save the training results, resulting in an access error.
What should I do if I get this MLS-C01 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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