The answer is that the missing sagemaker:UpdateEndpoint permission is the most likely cause of the CI/CD deployment failure. This is correct because when a pipeline attempts to deploy an updated model to an existing SageMaker endpoint, it must call the UpdateEndpoint API action, which requires explicit IAM authorization. Without this permission, the API call returns an access denied error, preventing the pipeline from modifying the endpoint’s configuration. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of SageMaker’s fine-grained IAM actions and how they map to deployment lifecycle stages—a common trap is confusing CreateEndpoint (for new endpoints) with UpdateEndpoint (for existing ones). Remember the memory tip: “To update, you must permit—UpdateEndpoint is the key to the edit.”
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.
An ML engineer is troubleshooting why an automated CI/CD pipeline cannot deploy an updated model to an existing SageMaker endpoint. The pipeline uses the IAM role that has the attached policy shown in the exhibit. What is the MOST likely cause of the failure?
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 pipeline tries to update an existing endpoint, but the sagemaker:UpdateEndpoint action is not allowed.
The pipeline is attempting to deploy an updated model to an existing SageMaker endpoint, which requires the sagemaker:UpdateEndpoint action. The IAM policy shown in the exhibit (not provided here but implied) does not include this action, so the API call fails with an access denied error. Without explicit permission to update the endpoint, the CI/CD pipeline cannot modify the deployed configuration.
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 pipeline tries to update an existing endpoint, but the sagemaker:UpdateEndpoint action is not allowed.
Why this is correct
The policy does not include sagemaker:UpdateEndpoint, which is required to update an existing endpoint. Without this permission, the update 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 pipeline tries to create a new endpoint, but the sagemaker:CreateEndpoint action is denied.
Why it's wrong here
The policy allows sagemaker:CreateEndpoint, so creation is permitted. The issue is with updating an existing endpoint.
✗
The pipeline tries to delete the old endpoint, but the sagemaker:DeleteEndpoint action is denied by a Deny statement.
Why it's wrong here
The Deny statement blocks Delete actions, but the pipeline is trying to update, not delete. The lack of Update permission is the issue.
✗
The pipeline attempts to invoke the endpoint, but the sagemaker:InvokeEndpoint action is denied.
Why it's wrong here
The policy allows sagemaker:InvokeEndpoint, so invocation is not the issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the actions required for updating an existing endpoint (UpdateEndpoint) with those for creating a new one (CreateEndpoint), leading them to incorrectly select Option B when the pipeline is actually performing an update.
Detailed technical explanation
How to think about this question
SageMaker endpoints are updated using the UpdateEndpoint API, which performs a blue/green deployment by creating a new endpoint configuration and shifting traffic gradually. The IAM policy must include sagemaker:UpdateEndpoint and sagemaker:UpdateEndpointWeightsAndCapacities (if traffic adjustments are needed) for the deployment to succeed. A common real-world scenario is when a CI/CD pipeline fails because the IAM role lacks these specific actions, even though it has broader permissions like sagemaker:CreateEndpoint.
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.
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: The pipeline tries to update an existing endpoint, but the sagemaker:UpdateEndpoint action is not allowed. — The pipeline is attempting to deploy an updated model to an existing SageMaker endpoint, which requires the sagemaker:UpdateEndpoint action. The IAM policy shown in the exhibit (not provided here but implied) does not include this action, so the API call fails with an access denied error. Without explicit permission to update the endpoint, the CI/CD pipeline cannot modify the deployed configuration.
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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