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SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. 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 stateless web application on Amazon ECS with Fargate. The application must be resilient to individual task failures and Availability Zone failures. Which three steps should the company take to achieve this resilience? (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
✓
Configure the ECS service to use a spread placement strategy across Availability Zones.
Configuring the ECS service with a spread placement strategy across Availability Zones ensures tasks are distributed across multiple AZs, providing resilience against AZ failures. Setting a minimum healthy percent of 50 and a maximum percent of 200 allows the service to maintain at least half of the desired tasks during deployments or failures while scaling up to replace failed tasks without downtime. Using an Application Load Balancer (ALB) in front of the ECS service distributes incoming traffic across healthy tasks in different AZs, automatically rerouting traffic if a task or AZ fails.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse stateless applications with stateful ones and incorrectly choose to store session data in EFS, or they may think placing tasks in a single subnet improves performance without considering the single point of failure risk.
Detailed technical explanation
How to think about this question
The spread placement strategy in ECS uses the 'spread' constraint with the 'availability-zone' dimension to evenly distribute tasks across AZs, leveraging the underlying Fargate infrastructure to isolate failures. The deployment configuration with minimum healthy percent 50 and maximum percent 200 allows ECS to perform rolling updates by stopping up to 50% of tasks before starting new ones, while the ALB's health checks (HTTP/HTTPS) at the target group level ensure traffic is only routed to tasks that pass health checks, enabling automatic failover.
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.
What to study next
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the ECS service to use a spread placement strategy across Availability Zones. — Configuring the ECS service with a spread placement strategy across Availability Zones ensures tasks are distributed across multiple AZs, providing resilience against AZ failures. Setting a minimum healthy percent of 50 and a maximum percent of 200 allows the service to maintain at least half of the desired tasks during deployments or failures while scaling up to replace failed tasks without downtime. Using an Application Load Balancer (ALB) in front of the ECS service distributes incoming traffic across healthy tasks in different AZs, automatically rerouting traffic if a task or AZ fails.
What should I do if I get this SAA-C03 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: Jun 11, 2026
This SAA-C03 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 SAA-C03 exam.
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