The correct answer is that the policy is not attached to the IAM role used by the notebook instance. This is because a SageMaker notebook instance assumes an IAM role to make AWS API calls, and the InvokeEndpoint permission must be explicitly granted to that role—not just created as a standalone policy. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of how IAM roles and policies interact with SageMaker resources, specifically that a policy document alone does not grant permissions until it is attached to the correct principal. A common trap is assuming the policy is effective simply because it exists in the account, but the key detail is the attachment point. Memory tip: think of the policy as a key and the IAM role as the lock—without attaching the key to the lock, the door stays closed.
MLS-C01 Modeling Practice Question
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.
Refer to the exhibit. An IAM policy is attached to a SageMaker notebook instance. A data scientist is trying to invoke the endpoint 'my-endpoint' from the notebook but receives an AccessDenied error. What is the likely cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy is not attached to the IAM role used by the notebook instance.
Option D is correct because the error 'AccessDenied' when invoking a SageMaker endpoint from a notebook instance typically indicates that the IAM role attached to the notebook does not have the required permissions. The policy shown in the exhibit grants sagemaker:InvokeEndpoint for the specific endpoint ARN, but if the policy is not attached to the IAM role that the notebook instance is using, the role lacks the permission, resulting in the AccessDenied error. Attaching the policy to the correct IAM role resolves 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.
✗
The policy allows InvokeEndpoint only for endpoints with the exact ARN, but the endpoint ARN is different.
Why it's wrong here
If the ARN is correct, this would work.
✗
The policy uses a wildcard for CreateEndpoint, which is too permissive.
Why it's wrong here
That is allowed but not the cause of the error.
✗
The policy does not allow sagemaker:CreateEndpoint for the specific endpoint.
Why it's wrong here
CreateEndpoint is not needed for invocation.
✓
The policy is not attached to the IAM role used by the notebook instance.
Why this is correct
Without the policy, InvokeEndpoint is denied.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between having a policy defined versus having it attached to the correct IAM role; candidates mistakenly assume that if a policy exists in the account, it automatically applies to all resources, but IAM policies must be explicitly attached to the role or user making the request.
Detailed technical explanation
How to think about this question
SageMaker notebook instances assume an IAM role to make AWS API calls; the role's permissions are defined by attached IAM policies. The InvokeEndpoint API call requires the sagemaker:InvokeEndpoint permission on the specific endpoint resource ARN. If the policy is not attached to the notebook's execution role, the role lacks the permission, and AWS IAM evaluates the effective permissions at runtime, returning AccessDenied. This is a common misconfiguration where the policy exists but is not associated with the correct principal.
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 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 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 is not attached to the IAM role used by the notebook instance. — Option D is correct because the error 'AccessDenied' when invoking a SageMaker endpoint from a notebook instance typically indicates that the IAM role attached to the notebook does not have the required permissions. The policy shown in the exhibit grants sagemaker:InvokeEndpoint for the specific endpoint ARN, but if the policy is not attached to the IAM role that the notebook instance is using, the role lacks the permission, resulting in the AccessDenied error. Attaching the policy to the correct IAM role resolves the issue.
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.
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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