- A
Deploy the endpoint in a VPC with subnets in at least two Availability Zones.
Provides AZ redundancy.
- B
Use a single instance type with the largest size to handle capacity.
Why wrong: Single instance is a single point of failure.
- C
Configure the endpoint with an initial instance count of at least 2.
Multiple instances provide redundancy.
- D
Use a single Availability Zone for simplicity.
Why wrong: Single AZ is not resilient.
- E
Enable auto-scaling to automatically replace unhealthy instances.
Auto-scaling maintains desired instance count.
Question 525 of 1,755
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 company is deploying a machine learning model to a SageMaker endpoint and wants to ensure that the endpoint is resilient to instance failures. Which THREE steps should the company take to achieve high availability? (Choose THREE.)
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
✓
Deploy the endpoint in a VPC with subnets in at least two Availability Zones.
Deploying the endpoint in a VPC with subnets in at least two Availability Zones ensures that if one Availability Zone fails, the endpoint can still serve traffic from the other zone. SageMaker endpoints distribute instances across the specified subnets, so multi-AZ deployment provides fault isolation and high availability at the infrastructure level.
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.
- ✓
Deploy the endpoint in a VPC with subnets in at least two Availability Zones.
Why this is correct
Provides AZ redundancy.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a single instance type with the largest size to handle capacity.
Why it's wrong here
Single instance is a single point of failure.
- ✓
Configure the endpoint with an initial instance count of at least 2.
Why this is correct
Multiple instances provide redundancy.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a single Availability Zone for simplicity.
Why it's wrong here
Single AZ is not resilient.
- ✓
Enable auto-scaling to automatically replace unhealthy instances.
Why this is correct
Auto-scaling maintains desired instance count.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a single large instance or a single Availability Zone is sufficient for high availability, but AWS's shared responsibility model requires you to architect for failure across multiple AZs and use auto-scaling to replace unhealthy instances automatically.
Detailed technical explanation
How to think about this question
SageMaker endpoints use Elastic Load Balancing (ELB) to distribute traffic across instances in different subnets. When you specify multiple subnets in different Availability Zones, SageMaker automatically provisions instances in each subnet, and the ELB health checks route traffic only to healthy instances. In a real-world scenario, a regional event like a power outage in one AZ would leave the other AZ's instances serving requests without manual intervention.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
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: Deploy the endpoint in a VPC with subnets in at least two Availability Zones. — Deploying the endpoint in a VPC with subnets in at least two Availability Zones ensures that if one Availability Zone fails, the endpoint can still serve traffic from the other zone. SageMaker endpoints distribute instances across the specified subnets, so multi-AZ deployment provides fault isolation and high availability at the infrastructure level.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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