AWS Certified Developer Associate Practice Test 5

Correct answer - "The ASG will terminate the EC2 Instance" : To maintain the same number of instances, Amazon EC2 Auto Scaling performs a periodic health check on running instances within an Auto Scaling group. When it finds that an instance is unhealthy, it terminates that instance and launches a new one. Amazon EC2 Auto Scaling creates a new scaling activity for terminating the unhealthy instance and then terminates it. Later, another scaling activity launches a new instance to replace the terminated instance.

Incorrect:

"The ASG will detach the EC2 instance from the group, and leave it running" - The goal of the auto scaling group is to get rid of the bad instance and replace it

"The ASG will keep the instance running and re-start the application" - The ASG does not have control of your application

"The ASG will format the root EBS drive on the EC2 instance and run the User Data again" - This will not happen, the ASG can make no assumption about the format of your EBS drive and User Data only runs once at instance first boot.

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