AWS Certified SysOps Administrator – Associate (legacy) — Question 634

A SysOps Administrator has configured health checks a target group for an Application Load Balancer. An Amazon EC2 instance belonging to the target group fails the health check.
What will happen next? (Choose two.)

Answer options

• A. The load balancer will continue to perform the health check on the EC2 instance.
• B. The EC2 instance will be terminated based on the health check failure.
• C. The EC2 instance will be rebooted.
• D. The load balancer will stop sending traffic to the EC2 instance.
• E. A new EC2 instance will be deployed to replace the unhealthy instance.

Correct answer: A, D

Explanation

When an Amazon EC2 instance fails an Application Load Balancer (ALB) health check, the load balancer stops routing traffic to it to avoid service disruptions, but it continues monitoring the instance to see if it becomes healthy again. The ALB does not automatically reboot, terminate, or launch replacement instances on its own; those actions require integration with an Auto Scaling group or other AWS management tools.