DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 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.)
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.
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.
✓
AWS::ElasticLoadBalancingV2::Listener
Why this is correct
The listener receives incoming traffic on a specific port.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Related concept
Read the scenario before looking for a memorised answer.
✓
AWS::ElasticLoadBalancingV2::ListenerRule
Why this is correct
Listener rules forward traffic to the appropriate target group.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS::AutoScaling::AutoScalingGroup
Why it's wrong here
Auto scaling groups are not used with Fargate; ECS manages scaling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Under the hood, the Listener evaluates incoming requests and forwards them to a default target group. For path-based or host-based routing to multiple ECS services, you must also define ListenerRules (Option D) that match specific conditions (e.g., path pattern /api/*) and forward to the appropriate target group. Each ECS Service (Option C) references a target group ARN in its LoadBalancers property, which is how the service registers its tasks with the ALB.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this DOP-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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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.
Question Discussion
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