AWS Certified SysOps Administrator – Associate — Question 189

A SysOps administrator is setting up a fleet of Amazon EC2 instances in an Auto Scaling group for an application. The fleet should have 50% CPU available at all times to accommodate bursts of traffic. The load will increase significantly between the hours of 09:00 and 17:00, 7 days a week.

How should the SysOps administrator configure the scaling of the EC2 instances to meet these requirements?

Answer options

• A. Create a target tracking scaling policy that runs when the CPU utilization is higher than 90%.
• B. Create a target tracking scaling policy that runs when the CPU utilization is higher than 50%. Create a scheduled scaling policy that ensures that the fleet is available at 09:00. Create a second scheduled scaling policy that scales in the fleet at 17:00.
• C. Set the Auto Scaling group to start with 2 instances by setting the desired instances, maximum instances, and minimum instances to 2. Create a scheduled scaling policy that ensures that the fleet is available at 09:00.
• D. Create a scheduled scaling policy that ensures that the fleet is available at 09:00. Create a second scheduled scaling policy that scales in the fleet at 17:00.

Correct answer: B

Explanation

Option B is correct because it combines both target tracking and scheduled scaling policies to maintain 50% CPU utilization during peak hours. Option A only focuses on high CPU usage and does not accommodate the scheduled demand increase, while Option C does not address the traffic spikes adequately. Option D lacks a target tracking policy to manage CPU utilization effectively.