You have an I/O and network-intensive application running on multiple Amazon EC2 instances that cannot handle a large ongoing increase in traffic. Each Amazon EC2 instance uses two Amazon EBS Provisioned IOPS volumes. All the instances are identical.

Answer options:

A.Create an AMI from each instance, and set up severral Auto Scaling groups with a larger instance type that has enhanced networking enabled.
B.Stop each instance and change each instance to a larger Amazon EC2 instance type that has enhanced networking enabled and is Amazon EBS-optimized. Ensure that RAID striping is also set up on each instance.
C.Add an instance-store volume for each running Amazon EC2 instance and implement RAID striping to improve I/O performance.
D.Add an Amazon EBS volume for each running Amazon EC2 instance and implement RAID striping to improve I/O performance.
E.Create an AMI from an instance, and set up an Auto Scaling group with an instance type that has enhanced networking enabled and is Amazon EBS-optimized.

Answer – E
The AWS Documentation mentions the following on AMI’s
An Amazon Machine Image (AMI) provides the information required to launch an instance, which is a virtual server in the cloud. You specify an AMI when you launch an instance, and you can launch as many instances from the AMI as you need. You can also launch instances from as many different AMIs as you need.
For more information on AMI’s, please visit the link:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.html
Enhanced Networking enables in higher bandwidth and performance, low latency and lower gitter. It uses single route IO visualized to provide higher performance networking capabilities on supported Instances types.
SRIOV is a method of virtualization for operations and lower CPU utilization when compared to traditional virtualized network interfaces.
There is no additional charge for using this.
Depending upon the Instance type Enhanced networking can be enabled in many forms.
How to enable the Enhanced Networking on an EC2 instance:
https://aws.amazon.com/premiumsupport/knowledge-center/enable-configure-enhanced-networking/