SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company runs a containerized application on Amazon ECS with Fargate launch type. The application is deployed across multiple Availability Zones. Recently, deployments have been failing because new tasks cannot register with the Application Load Balancer (ALB) target group. The health checks are failing. What is the MOST likely cause?
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
✓
The security group for the tasks does not allow inbound traffic from the ALB on the health check port.
If the security group for the tasks does not allow inbound traffic from the ALB on the health check port, health checks fail and tasks cannot register. Option B is incorrect because a desired count of zero would prevent new tasks from running, but the scenario describes deployments failing due to health check failures on new tasks. Option C is incorrect: an invalid container image would cause the task to fail to start, not cause health check failures after the task is running. Option D is incorrect because Fargate manages capacity; insufficient capacity would cause a different error (e.g., unable to provision tasks), not health check failures.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The security group for the tasks does not allow inbound traffic from the ALB on the health check port.
Why this is correct
Health checks fail if traffic is blocked.
- ✗
The ECS service is configured with a desired count of zero.
Why it's wrong here
Would not launch tasks.
- ✗
The task definition specifies an invalid container image.
Why it's wrong here
Would cause task start failure, not health check failure.
- ✗
The ECS cluster has insufficient capacity.
Why it's wrong here
Fargate handles capacity.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-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 SAP-C02 exam.