MLS-C01 Practice Question: Machine Learning Implementation and Operations
A company is deploying a machine learning model using Amazon SageMaker. The model needs to be updated frequently with new data. Which TWO approaches can be used to update the model without downtime? (Choose TWO.)
⚠ Common exam trap
Test-takers frequently think stopping or deleting the endpoint is acceptable for updates, but the exam emphasizes zero-downtime strategies like traffic shifting (A/B testing) and blue/green deployments, which avoid any service interruption.
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
✓
Use SageMaker A/B testing to gradually shift traffic to the new model variant.
Amazon SageMaker supports deploying multiple model variants behind a single endpoint using production variants. By using A/B testing (traffic shifting), you can gradually route a percentage of inference requests to the new model variant while the old variant continues serving the majority of traffic, enabling updates with zero downtime.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete the existing endpoint and create a new one with the updated model.
Why it's wrong here
Deleting the endpoint causes downtime until the new endpoint is in service.
- ✗
Directly update the model artifact in the existing endpoint configuration.
Why it's wrong here
Updating the model artifact requires redeploying the endpoint, which causes downtime.
- ✓
Use SageMaker A/B testing to gradually shift traffic to the new model variant.
Why this is correct
A/B testing with production variants allows traffic shifting without downtime.
- ✗
Stop the endpoint, update the model, and restart the endpoint.
Why it's wrong here
Stopping the endpoint causes downtime.
- ✓
Use a blue/green deployment by deploying the new model on a separate endpoint and then updating the DNS record.
Why this is correct
Blue/green deployment switches traffic to the new endpoint after it is ready, avoiding downtime.
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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.