MLS-C01 Practice Question: Machine Learning Implementation and Operations
A machine learning engineer is deploying a TensorFlow model to an Amazon SageMaker endpoint. The endpoint is behind an Application Load Balancer (ALB) for A/B testing. The engineer notices that the new variant is not receiving any traffic. What is the most likely cause?
⚠ Common exam trap
Many exam-takers confuse health check failures with traffic routing weights, assuming that a failing health check is the only reason a variant receives no traffic, when in fact a weight of 0 explicitly prevents traffic regardless of health status.
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 ALB target group weight for the new variant is set to 0.
If the ALB target group weight for the new variant is set to 0, the ALB will not route any traffic to that target group, even if the endpoint is healthy. In A/B testing setups, weights control the proportion of traffic sent to each variant; a weight of 0 effectively disables the variant.
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 new variant's health checks are failing.
Why it's wrong here
If failing, traffic goes to healthy targets, not zero.
- ✓
The ALB target group weight for the new variant is set to 0.
Why this is correct
Weight of 0 means no traffic is sent.
- ✗
The model is not compatible with the ALB's protocol.
Why it's wrong here
ALB supports HTTP/HTTPS, TensorFlow models use HTTP.
- ✗
The ALB is not configured to route to SageMaker endpoints.
Why it's wrong here
ALB can route to any HTTP endpoint.
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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.