The answer is that the new variant's model container is failing health checks, which prevents traffic from being routed to it. SageMaker endpoints only distribute traffic to variants that pass their configured health checks, so even if you set the new variant’s weight to 100%, the system will not shift traffic to a failing container. This occurs because the health check—typically an HTTP ping to the inference endpoint—detects issues like a misconfigured inference script, missing dependencies, or incompatible model artifacts, leaving the old variant handling all requests. On the AWS Certified Machine Learning Engineer Associate MLA-C01 exam, this scenario tests your understanding of how SageMaker’s routing logic depends on container readiness, not just weight settings. A common trap is assuming weight adjustments alone force traffic shifts, but the exam expects you to know that health check failures override weight configurations. Memory tip: “No green light, no traffic shift”—if the new variant fails its health check, the blue variant stays live regardless of weight.
MLA-C01 Deployment and Orchestration of ML Workflows Practice Question
This MLA-C01 practice question tests your understanding of deployment and orchestration of ml workflows. 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.
During a blue/green deployment of a SageMaker endpoint, the team notices that traffic is not being fully shifted to the new variant after the update. The endpoint has two variants with equal initial weights (50% each). The team wants to shift 100% traffic to the new variant. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The new variant's model container is failing health checks, so traffic is not routed to it
Option B is correct because SageMaker endpoints route traffic only to variants that pass health checks. If the new variant's model container fails health checks (e.g., due to a misconfigured inference script or incompatible dependencies), SageMaker will not send any traffic to it, regardless of the weight setting. This explains why traffic remains stuck at 50% on the old variant despite the intended shift to 100%.
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 new variant is using a different instance type that is not supported in the same endpoint
Why it's wrong here
Different instance types can coexist in an endpoint; this would cause the update to fail entirely.
✓
The new variant's model container is failing health checks, so traffic is not routed to it
Why this is correct
SageMaker performs health checks; if the new variant fails, it stays in 'Creating' state and no traffic is routed.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The new variant's weight was set to 100 but the maximum weight per variant is 50
Why it's wrong here
There is no maximum weight of 50; weights can be set up to 100.
✗
The endpoint's load balancer is misconfigured and not forwarding traffic to the new variant
Why it's wrong here
SageMaker endpoints do not use a customer-managed load balancer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume weight settings alone control traffic distribution, overlooking that SageMaker enforces health checks as a prerequisite for routing traffic to any variant.
Detailed technical explanation
How to think about this question
SageMaker performs health checks by sending HTTP GET requests to the /ping endpoint on the container's port (default 8080). If the container returns a non-200 status or fails to respond within 2 seconds, the variant is marked unhealthy and traffic is withheld. This mechanism ensures that only responsive model variants serve inference requests, preventing silent failures during blue/green deployments.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Deployment and Orchestration of ML Workflows — This question tests Deployment and Orchestration of ML Workflows — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The new variant's model container is failing health checks, so traffic is not routed to it — Option B is correct because SageMaker endpoints route traffic only to variants that pass health checks. If the new variant's model container fails health checks (e.g., due to a misconfigured inference script or incompatible dependencies), SageMaker will not send any traffic to it, regardless of the weight setting. This explains why traffic remains stuck at 50% on the old variant despite the intended shift to 100%.
What should I do if I get this MLA-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". 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.
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 MLA-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 MLA-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.