You have a content management system running on an Amazon EC2 instance that is approaching 100% CPU utilization. Which option will reduce load on the Amazon EC2 instance?
A. Create a load balancer, and register the Amazon EC2 instance with it
B. Create a CloudFront distribution, and configure the Amazon EC2 instance as the origin
C. Create an Auto Scaling group from the instance using the CreateAutoScalingGroup action
D. Create a launch configuration from the instance using the CreateLaunchConfiguration action
The right answer is B. A CMS (Content Management System) is usually read-heavy, i.e., content is downloaded from it. Hence, Cloudfront distributions can be used to cache the downloaded content so that the origin (the EC2 Instance) is protected from subsequent requests for the same file.
C is not correct because an ASG will not automatically reduce the load from the busy instance – it will just create a new instance which will sit there doing nothing, processing no requests, unless you also use an ELB to actually distribute the load, but the question does not talk about any ELB (and given that option A talks about adding an ELB, we can safely assume that the original scenario has no ELB-s in it – by the way, option A is incorrect because it does not add a second EC2 instance under the ELB)
Answer B is more logic