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.
A data scientist is trying to launch a SageMaker training job using an IAM role with the above policy. The training job fails with an access denied error. What is the MOST likely reason?
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 policy does not include s3:ListBucket permission
The policy grants s3:GetObject and s3:PutObject permissions on the S3 bucket ARN with a /* suffix, but SageMaker training jobs also require s3:ListBucket permission at the bucket level (without the /*) to enumerate objects and validate paths during job creation. Without s3:ListBucket, the training job fails with an access denied error even though read/write permissions are present.
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 policy does not include s3:ListBucket permission
Why this is correct
SageMaker needs ListBucket to access objects in the bucket.
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 sagemaker:StopTrainingJob action is not required
Why it's wrong here
Extra actions are fine.
✗
The sagemaker:CreateTrainingJob action is not allowed for the specific instance type
Why it's wrong here
The policy allows all SageMaker training actions.
✗
The S3 bucket ARN should not include the /* suffix
Why it's wrong here
The /* suffix is correct for object-level permissions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the subtle distinction between bucket-level actions (s3:ListBucket) and object-level actions (s3:GetObject, s3:PutObject), where candidates mistakenly assume object permissions are sufficient for SageMaker training jobs.
Detailed technical explanation
How to think about this question
SageMaker training jobs use the S3 API to list bucket contents (ListBucket) to verify input data paths and output locations before starting the job. Even if GetObject and PutObject are allowed, the absence of ListBucket causes the SageMaker service to fail the authorization check during the CreateTrainingJob API call. In real-world scenarios, this often occurs when using a restrictive IAM policy that grants object-level access but omits the bucket-level list permission, leading to a confusing access denied error.
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 policy does not include s3:ListBucket permission — The policy grants s3:GetObject and s3:PutObject permissions on the S3 bucket ARN with a /* suffix, but SageMaker training jobs also require s3:ListBucket permission at the bucket level (without the /*) to enumerate objects and validate paths during job creation. Without s3:ListBucket, the training job fails with an access denied error even though read/write permissions are present.
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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This MLS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MLS-C01 exam.
Question Discussion
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