- A
Create an Auto Scaling group for the Fargate tasks.
Why wrong: Fargate tasks are managed by ECS, not Auto Scaling groups.
- B
Set the desired number of tasks to at least 2.
Multiple tasks provide redundancy.
- C
Associate an Application Load Balancer with the ECS service.
An ALB distributes traffic to tasks across AZs.
- D
Configure the service to place tasks in at least two subnets in different Availability Zones.
Spreading tasks across AZs ensures availability if one AZ fails.
- E
Use a DynamoDB table to store task state.
Why wrong: DynamoDB is not required for ECS service configuration.
Question 663 of 1,616
ECS Fargate High Availability: Tasks, ALB, Multi-AZ
This DVA-C02 practice question tests your understanding of development with aws services. 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 containerized application on Amazon ECS using the Fargate launch type. The application must be highly available across multiple Availability Zones. The developer needs to configure the ECS service. Which THREE configuration options are required? (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
✓
Set the desired number of tasks to at least 2.
For high availability with Amazon ECS Fargate, you must set the desired number of tasks to at least 2 (option B) so that if one task fails, the other can continue serving traffic. This ensures the service can maintain the minimum healthy task count across Availability Zones, which is a core requirement for fault tolerance.
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.
- ✗
Create an Auto Scaling group for the Fargate tasks.
Why it's wrong here
Fargate tasks are managed by ECS, not Auto Scaling groups.
- ✓
Set the desired number of tasks to at least 2.
Why this is correct
Multiple tasks provide redundancy.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Associate an Application Load Balancer with the ECS service.
Why this is correct
An ALB distributes traffic to tasks across AZs.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure the service to place tasks in at least two subnets in different Availability Zones.
Why this is correct
Spreading tasks across AZs ensures availability if one AZ fails.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a DynamoDB table to store task state.
Why it's wrong here
DynamoDB is not required for ECS service configuration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think Auto Scaling groups are required for Fargate (option A) because they confuse the EC2 launch type with Fargate, or they believe DynamoDB is needed for state persistence (option E) when ECS handles task state natively.
Detailed technical explanation
How to think about this question
Under the hood, ECS Fargate tasks run on isolated virtual machines managed by AWS, and the service scheduler uses the desired count and placement constraints (like subnets in different AZs) to distribute tasks. The Application Load Balancer (ALB) performs health checks on each task and routes traffic only to healthy ones, enabling automatic recovery if a task or AZ fails. In a real-world scenario, setting the desired count to 1 would create a single point of failure, even if the task is placed in a multi-AZ subnet, because the service cannot maintain availability if that one task becomes unhealthy.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set the desired number of tasks to at least 2. — For high availability with Amazon ECS Fargate, you must set the desired number of tasks to at least 2 (option B) so that if one task fails, the other can continue serving traffic. This ensures the service can maintain the minimum healthy task count across Availability Zones, which is a core requirement for fault tolerance.
What should I do if I get this DVA-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 DVA-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 DVA-C02 exam.
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