Your company is planning to use an EC2 instance for handling voice-related traffic. A custom application will be installed on a Linux-based instance. Which of the following implementation will help to achieve higher bandwidth for the application?

Answer options:

A.Enable Enhanced networking on the instance.
B.Use a Network load balancer in front of the EC2 instance.
C.Use a placement group for the EC2 Instance.
D.Use an Application load balancer in front of the EC2 instance.

Answer - A
The best choice is to use Enhanced Networking. The AWS Documentation mentions the following on Enhanced Networking.
Enhanced networking uses single root I/O virtualization (SR-IOV) to provide high-performance networking capabilities on supported instance types. SR-IOV is a method of device virtualization that provides higher I/O performance and lower CPU utilization when compared to traditional virtualized network interfaces. Enhanced networking provides higher bandwidth, higher packet per second (PPS) performance, and consistently lower inter-instance latencies. There is no additional charge for using enhanced networking.
Options B, C and D are used for multiple instances ideally.
For more information on Enhanced Networking, please visit the following URL:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html