AWS Certified SysOps Administrator – Associate — Question 38

A company runs an application on an Amazon EC2 instance. A SysOps administrator creates an Auto Scaling group and an Application Load Balancer (ALB) to handle an increase in demand. However, the EC2 instances are failing the health check.
What should the SysOps administrator do to troubleshoot this issue?

Answer options

• A. Verify that the Auto Scaling group is configured to use all AWS Regions.
• B. Verify that the application is running on the protocol and the port that the listener is expecting.
• C. Verify the listener priority in the ALB. Change the priority if necessary.
• D. Verify the maximum number of instances in the Auto Scaling group. Change the number if necessary.

Correct answer: B

Explanation

The correct answer is B because the health check failures often occur when the application is not responding on the expected protocol and port. Options A, C, and D do not address the direct communication between the ALB and the EC2 instances, which is critical for passing health checks.