MLS-C01 Modeling Practice Question
Exhibit
Refer to the exhibit.
```
aws sagemaker create-training-job \
--training-job-name my-job \
--algorithm-specification TrainingImage=123456789012.dkr.ecr.us-east-1.amazonaws.com/my-custom-image:latest,TrainingInputMode=File \
--role-arn arn:aws:iam::123456789012:role/SageMakerRole \
--input-data-config ChannelName=training,DataSource={S3DataSource={S3Uri=s3://my-bucket/train/,S3DataType=S3Prefix,S3DataDistributionType=FullyReplicated}} \
--output-data-config S3OutputPath=s3://my-bucket/output/ \
--resource-config InstanceType=ml.m5.large,InstanceCount=1,VolumeSizeInGB=10 \
--stopping-condition MaxRuntimeInSeconds=3600
```Refer to the exhibit. The training job 'my-job' failed with the error 'Unable to pull image from ECR'. What is the most likely cause?
⚠ Common exam trap
The MLS-C01 exam often tests the misconception that any IAM role with basic SageMaker permissions can pull images from ECR, but the trap here is that the role must have explicit ECR permissions (not just SageMaker permissions) to download the container image, and candidates may incorrectly blame the instance type or S3 bucket location instead.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IAM role does not have permission to pull images from the ECR repository.
The error 'Unable to pull image from ECR' indicates that the SageMaker training job could not retrieve the custom Docker image stored in Amazon ECR. The most likely cause is that the IAM role associated with the training job lacks the `ecr:GetDownloadUrlForLayer` and `ecr:BatchGetImage` permissions required to pull images from the ECR repository. Without these permissions, SageMaker cannot authenticate and download the container image, even if the repository and image exist.
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 IAM role does not have permission to pull images from the ECR repository.
Why this is correct
Without ecr:GetDownloadUrlForLayer and BatchGetImage, the pull fails.
- ✗
The instance type ml.m5.large does not support custom images.
Why it's wrong here
Custom images are supported on all instance types.
- ✗
The S3 bucket for training data is in a different account.
Why it's wrong here
The error is about ECR, not S3.
- ✗
The role ARN is incorrect.
Why it's wrong here
The ARN appears valid.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.