The correct answer is to attach an IAM policy to the SageMaker execution role that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the private ECR repository. This configuration is necessary because SageMaker’s training job runs under the execution role, and when pulling a custom Docker container from a private ECR repository, that role must authenticate with ECR and retrieve the image layers. The ecr:GetAuthorizationToken permission generates a temporary token for the Docker client, while ecr:BatchGetImage and ecr:GetDownloadUrlForLayer allow SageMaker to download the actual container image. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of how SageMaker integrates with ECR for custom containers, often appearing as a distractor where candidates mistakenly assign permissions to the ECR repository policy or the data scientist’s user role. A common trap is confusing S3 bucket policies with ECR resource-based policies—ECR uses IAM, not bucket policies. Memory tip: think “Get, Batch, Get” for the three required actions—GetAuthorizationToken, BatchGetImage, and GetDownloadUrlForLayer.
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 using Amazon SageMaker to train a model and wants to use a custom Docker container for training. The container requires access to a private Amazon ECR repository. Which IAM role configuration is needed?
Attach an IAM policy to the SageMaker execution role that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the ECR repository.
These permissions allow SageMaker to pull the container image.
B
Use the AWS account owner's IAM role as the SageMaker execution role.
Why wrong: The SageMaker execution role must have the necessary permissions; using the account owner's role is not secure.
C
Create a new IAM user with ECR access and store credentials in SageMaker.
Why wrong: SageMaker does not use IAM user credentials for container access.
D
Add a bucket policy to the ECR repository allowing access from the SageMaker execution role.
Why wrong: ECR uses resource-based policies, not bucket policies.
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 the SageMaker execution role that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the ECR repository.
Option C is correct because the SageMaker execution role must have an IAM policy that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the ECR repository. Option A is wrong because the ECR repository does not grant permissions to the SageMaker role via bucket policies. Option B is wrong because SageMaker does not use the ECR repository owner's role. Option D is wrong because the SageMaker role is the appropriate entity to grant permissions.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 the SageMaker execution role that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the ECR repository.
Why this is correct
These permissions allow SageMaker to pull the container image.
Related concept
Authentication checks who the user is.
✗
Use the AWS account owner's IAM role as the SageMaker execution role.
Why it's wrong here
The SageMaker execution role must have the necessary permissions; using the account owner's role is not secure.
✗
Create a new IAM user with ECR access and store credentials in SageMaker.
Why it's wrong here
SageMaker does not use IAM user credentials for container access.
✗
Add a bucket policy to the ECR repository allowing access from the SageMaker execution role.
Why it's wrong here
ECR uses resource-based policies, not bucket policies.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related MLS-C01 questions on access control and AAA configuration.
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Attach an IAM policy to the SageMaker execution role that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the ECR repository. — Option C is correct because the SageMaker execution role must have an IAM policy that allows ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken for the ECR repository. Option A is wrong because the ECR repository does not grant permissions to the SageMaker role via bucket policies. Option B is wrong because SageMaker does not use the ECR repository owner's role. Option D is wrong because the SageMaker role is the appropriate entity to grant permissions.
What should I do if I get this MLS-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related MLS-C01 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.