- A
Configure the ECS service to run tasks in a single Availability Zone to reduce network latency.
Why wrong: Incorrect: Single AZ is a single point of failure.
- B
Configure the ECS service to run tasks in at least two Availability Zones.
Correct: Running tasks in multiple AZs provides fault tolerance.
- C
Use the awsvpc network mode for the task definition.
Why wrong: Incorrect: Network mode does not affect AZ placement.
- D
Place the ECS service behind an Application Load Balancer.
Correct: An ALB distributes traffic across tasks, enabling high availability.
- E
Use Fargate Spot capacity providers to reduce costs.
Why wrong: Incorrect: Fargate Spot tasks can be interrupted, reducing reliability.
Question 1,475 of 1,546
How to Make ECS Fargate Highly Available Across Multiple AZs
This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 has a production application running on Amazon ECS with Fargate. The application must be highly available across multiple Availability Zones. Which TWO configurations should be implemented?
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 run tasks in at least two Availability Zones.
Option B is correct because running ECS tasks across at least two Availability Zones ensures that if one AZ fails, the service continues to operate in the other AZ, meeting the high-availability requirement. Option D is correct because placing the ECS service behind an Application Load Balancer (ALB) enables health checks and automatic traffic distribution to healthy tasks, which is essential for maintaining availability during task failures or AZ disruptions.
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.
- ✗
Configure the ECS service to run tasks in a single Availability Zone to reduce network latency.
Why it's wrong here
Incorrect: Single AZ is a single point of failure.
- ✓
Configure the ECS service to run tasks in at least two Availability Zones.
Why this is correct
Correct: Running tasks in multiple AZs provides fault tolerance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use the awsvpc network mode for the task definition.
Why it's wrong here
Incorrect: Network mode does not affect AZ placement.
- ✓
Place the ECS service behind an Application Load Balancer.
Why this is correct
Correct: An ALB distributes traffic across tasks, enabling high availability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Fargate Spot capacity providers to reduce costs.
Why it's wrong here
Incorrect: Fargate Spot tasks can be interrupted, reducing reliability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network mode (awsvpc) with high-availability configuration, but awsvpc is about networking capabilities (e.g., per-task ENI) and does not inherently provide multi-AZ resilience.
Detailed technical explanation
How to think about this question
When using ECS with Fargate, the service scheduler distributes tasks across the subnets specified in the service configuration; by providing subnets from at least two AZs, the scheduler places tasks in those AZs. The ALB performs health checks on each task's target group port and automatically reroutes traffic away from unhealthy tasks, and cross-zone load balancing ensures traffic is evenly distributed even if tasks are in different AZs. In a real-world scenario, if an AZ experiences an outage, the ALB will stop sending traffic to tasks in that AZ, and ECS will attempt to replace those tasks in the remaining healthy AZs, maintaining service continuity.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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Reliability and Business Continuity — study guide chapter
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — 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 run tasks in at least two Availability Zones. — Option B is correct because running ECS tasks across at least two Availability Zones ensures that if one AZ fails, the service continues to operate in the other AZ, meeting the high-availability requirement. Option D is correct because placing the ECS service behind an Application Load Balancer (ALB) enables health checks and automatic traffic distribution to healthy tasks, which is essential for maintaining availability during task failures or AZ disruptions.
What should I do if I get this SOA-C02 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 SOA-C02 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 SOA-C02 exam.
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