AWS Certified Cloud Practitioner — Question 948

Which of the following is a way to use Amazon EC2 Auto Scaling groups to scale capacity in the AWS Cloud?

Answer options

• A. Scale the number of EC2 instances in or out automatically, based on demand.
• B. Use serverless EC2 instances.
• C. Scale the size of EC2 instances up or down automatically, based on demand.
• D. Transfer unused CPU resources between EC2 instances.

Correct answer: A

Explanation

Amazon EC2 Auto Scaling groups scale horizontally by automatically adding (scaling out) or removing (scaling in) EC2 instances to match current demand. Changing the size of an instance (scaling vertically) is not a function of Auto Scaling groups, and EC2 instances are infrastructure-as-a-service (IaaS) rather than serverless.