AWS Certified SysOps Administrator – Associate (legacy) — Question 205

A user has created an Auto Scaling group with default configurations from CLI. The user wants to setup the CloudWatch alarm on the EC2 instances, which are launched by the Auto Scaling group. The user has setup an alarm to monitor the CPU utilization every minute. Which of the below mentioned statements is true?

Answer options

• A. It will fetch the data at every minute but the four data points [corresponding to 4 minutes] will not have value since the EC2 basic monitoring metrics are collected every five minutes
• B. It will fetch the data at every minute as detailed monitoring on EC2 will be enabled by the default launch configuration of Auto Scaling
• C. The alarm creation will fail since the user has not enabled detailed monitoring on the EC2 instances
• D. The user has to first enable detailed monitoring on the EC2 instances to support alarm monitoring at every minute

Correct answer: B

Explanation

The correct answer is B because, with Auto Scaling's default launch configuration, detailed monitoring is enabled, allowing the alarm to fetch data every minute. Option A is incorrect as the data will be available due to detailed monitoring. Option C is not valid because the alarm creation will succeed with detailed monitoring already enabled, and option D is wrong since detailed monitoring is already provided by default.