The answer is that the IAM policy is missing the iam:PassRole permission, which is the most likely cause of the SageMaker endpoint access denied error. When deploying a SageMaker endpoint, the service must assume an IAM role to access resources like S3 buckets or EC2 instances, and the iam:PassRole action explicitly grants SageMaker permission to pass that role to itself. Without this permission, even if all other SageMaker actions are allowed, the deployment fails with an access denied error. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this concept tests your understanding of how IAM roles interact with AWS services during model deployment—a common trap is assuming that full SageMaker access alone is sufficient. Remember that PassRole is the gatekeeper: SageMaker can’t use any role unless the policy explicitly says it can. A helpful mnemonic is “Pass to deploy”—without the PassRole permission, your endpoint stays stuck at the gate.
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.
A machine learning engineer is trying to deploy a model using a SageMaker endpoint but receives an access denied error. The IAM policy attached to the role is shown in the exhibit. What is the MOST likely cause of the error?
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 iam:PassRole.
The error occurs because the IAM role used by SageMaker does not have the iam:PassRole permission, which is required to allow SageMaker to assume the role and access the necessary resources (e.g., S3 buckets, EC2 instances) during endpoint deployment. Without this permission, SageMaker cannot pass the role to the service, resulting in an access denied error even if other SageMaker actions are allowed.
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 sagemaker:CreateEndpoint.
Why it's wrong here
It does include sagemaker:CreateEndpoint.
✗
The policy does not specify resource ARNs.
Why it's wrong here
Resource '*' is allowed.
✗
The policy does not include sagemaker:InvokeEndpoint.
Why it's wrong here
It does include sagemaker:InvokeEndpoint.
✓
The policy does not include iam:PassRole.
Why this is correct
SageMaker requires iam:PassRole to use the execution role.
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
The trap here is that candidates often focus on missing SageMaker-specific actions (like CreateEndpoint or InvokeEndpoint) rather than recognizing that the fundamental issue is the missing iam:PassRole permission, which is a common prerequisite for any AWS service that needs to assume a role.
Detailed technical explanation
How to think about this question
Under the hood, SageMaker uses AWS Security Token Service (STS) to assume the IAM role via the PassRole action, which requires the iam:PassRole permission on the role ARN. Without this, the SageMaker service cannot obtain temporary credentials to access resources like S3 buckets for model artifacts or ECR for container images, causing the deployment to fail with an access denied error even if all other permissions are correctly configured.
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 iam:PassRole. — The error occurs because the IAM role used by SageMaker does not have the iam:PassRole permission, which is required to allow SageMaker to assume the role and access the necessary resources (e.g., S3 buckets, EC2 instances) during endpoint deployment. Without this permission, SageMaker cannot pass the role to the service, resulting in an access denied error even if other SageMaker actions are allowed.
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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