An Auto Scaling Group fronted by an ALB keeps instances running even when the application process has crashed (though the EC2 instance itself is still “running”). How can the ASG detect and replace these instances?
A) Switch the ASG health check type from EC2 to ELB.
B) Reduce the ASG’s minimum size to zero.
C) Disable the load balancer health checks.
D) Increase the cooldown period.
Correct Answer: A
Explanation: With the ELB health check type, the ASG treats an instance as unhealthy if it fails the load balancer’s application-level health check (not just the EC2 system check), then replaces it. (B) removes capacity. (C) removes the needed signal. (D) cooldowns affect scaling timing, not health detection.