Question 1,586 of 418
DOP-C02 Configuration Management and IaC Practice Question
A DevOps engineer is designing an infrastructure as code solution for a microservices application that runs on Amazon ECS with Fargate. The application requires a shared Application Load Balancer (ALB) and multiple ECS services. Which CloudFormation resources are required to expose each service behind the ALB? (Choose THREE.)
⚠ Common exam trap
The trap here is that candidates often select the LoadBalancer resource (Option B) thinking it is required for each service, but the LoadBalancer is a shared resource created once, while the Listener, ListenerRules, and ECS Service are the per-service components that enable routing.
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
✓
AWS::ElasticLoadBalancingV2::Listener
AWS::ElasticLoadBalancingV2::Listener is correct because it defines the protocol and port (e.g., HTTP:80) on which the ALB accepts traffic. Without a listener, the ALB cannot receive incoming requests. This resource is essential for routing traffic to target groups that are associated with ECS services.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AWS::ElasticLoadBalancingV2::Listener
Why this is correct
The listener receives incoming traffic on a specific port.
- ✗
AWS::ElasticLoadBalancingV2::LoadBalancer
Why it's wrong here
The ALB is shared and created once, not per service.
- ✓
AWS::ECS::Service
Why this is correct
The ECS service registers tasks with the target group.
- ✓
AWS::ElasticLoadBalancingV2::ListenerRule
Why this is correct
Listener rules forward traffic to the appropriate target group.
- ✗
AWS::AutoScaling::AutoScalingGroup
Why it's wrong here
Auto scaling groups are not used with Fargate; ECS manages scaling.
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Last reviewed: Jun 24, 2026
This DOP-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 DOP-C02 exam.
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