Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 222 discussion

CW agent->CW metric->CW alarm->Lambda action

This is a bad question design. The question is looking for a solution for “The network routes are not updated when the instance replacement occurs.”, which means the ASG already has the capability to detect the failure node. With this assumption, there is NO need to install a CloudWatch agent on the EC2 instance, cause the CloudWatch agent in B is doing the same thing. The correct solution is to use the ASG Lifecycle Hook to invoke the Lambda to update the route. A better solution is to create a loadbalancer targeting the ASG, and update the route to point to the loadbalancer. With this solution, there is no need to update the route anymore.

BDE.. but a professional should use ASG Lifecycle hooks https://docs.aws.amazon.com/autoscaling/ec2/userguide/lifecycle-hooks.html

you cannot update templates you can version them. ADE

Answer - BDE Install CW agent on all instances using CF template Configure CW to send out metrics to SNS Configure Lambda as SNS target to terminate instance and update n/w routes on the new instances

B, D, E

A and F must be wrong.

B, D and E

b-d-e seems reasonable.

A is redundant because "Whenever the analysis software stops working, the Auto Scaling group replaces an instance." C is not correct. AWS System Manager Agebt is not used "to send process metrics for the application." So, B, D and E because they make a flow.

b----d----e