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.
A data scientist submits a SageMaker training job with the provided configuration. The job fails immediately with the error 'Algorithm not found: 382416733822.dkr.ecr.us-west-2.amazonaws.com/sagemaker-xgboost:1.2-1'. What is the most likely cause?
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.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ECR repository URI is incorrect or the image does not exist.
The error 'Algorithm not found' indicates that the ECR repository URI specified in the training job configuration does not point to an existing image. The URI '382416733822.dkr.ecr.us-west-2.amazonaws.com/sagemaker-xgboost:1.2-1' is the standard SageMaker built-in XGBoost image for the us-west-2 region, but the version '1.2-1' may not exist or the URI is malformed. SageMaker training jobs require a valid ECR image URI to launch the container; if the image is not found in the registry, the job fails immediately with this error.
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 training region is different from the image region.
Why it's wrong here
The URI includes us-west-2, and job is in same region.
✓
The ECR repository URI is incorrect or the image does not exist.
Why this is correct
The URI may have wrong account ID or tag.
Clue confirmation
The clue words "most likely", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The input data format is incorrect.
Why it's wrong here
Error occurs before data is read.
✗
The IAM role does not have permission to pull the image.
Why it's wrong here
Would get access denied, not 'algorithm not found'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse an 'Algorithm not found' error with a permissions issue (Option D) or a region mismatch (Option A), but the error message is specific to the image URI not existing in ECR, not to access or region problems.
Detailed technical explanation
How to think about this question
SageMaker uses Amazon ECR to store container images, and the URI format is 'account-id.dkr.ecr.region.amazonaws.com/repository-name:tag'. The account ID '382416733822' corresponds to the SageMaker service account for the us-west-2 region, but the tag '1.2-1' may be deprecated or never existed; SageMaker XGBoost versions follow a specific release cycle (e.g., '1.0-1', '1.2-2'). Under the hood, SageMaker's training job submission validates the image URI by checking ECR for the repository and tag; if either is missing, it throws an 'Algorithm not found' error before any container is launched.
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 ECR repository URI is incorrect or the image does not exist. — The error 'Algorithm not found' indicates that the ECR repository URI specified in the training job configuration does not point to an existing image. The URI '382416733822.dkr.ecr.us-west-2.amazonaws.com/sagemaker-xgboost:1.2-1' is the standard SageMaker built-in XGBoost image for the us-west-2 region, but the version '1.2-1' may not exist or the URI is malformed. SageMaker training jobs require a valid ECR image URI to launch the container; if the image is not found in the registry, the job fails immediately with this error.
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", "immediately / without restart". 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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