Home / Amazon / CLF-C01 / Question 218

How do Amazon EC2 Auto Scaling groups help achieve high availability for a web application?

• A. They automatically add more instances across multiple AWS Regions based on global demand of the application.

• B. They automatically add or replace instances across multiple Availability Zones when the application needs it.

• C. They enable the application's static content to reside closer to end users.

• D. They are able to distribute incoming requests across a tier of web server instances.

When the unhealthy Availability Zone returns to a healthy state, Auto Scaling automatically redistributes the application instances evenly across all of the designated Availability Zones.https://docs.aws.amazon.com/autoscaling/ec2/userguide/auto-scaling-benefits.html