The answer is to attach an IAM policy to SageMakerRole that grants s3:GetObject on the bucket. This is correct because SageMaker training jobs assume an IAM execution role to access resources, and without explicit s3:GetObject permission for the input data bucket, the service cannot read the training data, even if the bucket policy allows public access. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of how SageMaker’s IAM role interacts with S3 permissions, often appearing as a trap where candidates confuse bucket policies with role-based access. A common mistake is to modify the bucket policy or adjust training job parameters like VolumeSizeInGB, but the core issue is always the IAM role’s permissions. Remember the memory tip: “Role reads, bucket allows” — the IAM role must have the GetObject action, while the bucket policy only needs to trust the role’s account.
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.
Refer to the exhibit. A data scientist runs the AWS CLI command to create a SageMaker training job. The training job fails because the input data is not accessible. Which step should the data scientist take to fix the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach an IAM policy to SageMakerRole that grants s3:GetObject on the bucket
Option B is correct because the IAM role must have s3:GetObject permission for the S3 bucket. Option A is wrong because the bucket policy is separate. Option C is wrong because VolumeSizeInGB is for local storage, not S3. Option D is wrong because VPC configuration is not the 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.
✓
Attach an IAM policy to SageMakerRole that grants s3:GetObject on the bucket
Why this is correct
The role needs explicit S3 read permissions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add a VpcConfig to the training job
Why it's wrong here
Network issue not indicated.
✗
Modify the bucket policy to allow s3:GetObject for any principal
Why it's wrong here
Too broad; IAM role should be used.
✗
Increase VolumeSizeInGB to 50
Why it's wrong here
Volume size is for local storage, not S3 access.
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 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: Attach an IAM policy to SageMakerRole that grants s3:GetObject on the bucket — Option B is correct because the IAM role must have s3:GetObject permission for the S3 bucket. Option A is wrong because the bucket policy is separate. Option C is wrong because VolumeSizeInGB is for local storage, not S3. Option D is wrong because VPC configuration is not the 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.
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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