You need to deploy a high performance computing (HPC) and machine learning application in AWS Linux EC2 instances. The performance of inter-instance communication is very critical for the application. You want to attach a network device to the instance so that the computing performance can be greatly improved. Which of the following options can achieve the best performance?

Answer options:

A.Enable enhanced networking feature in the EC2 instance.
B.Configure Elastic Fabric Adapter (EFA) in the instance.
C.Attach high speed Elastic Network Interface (ENI) in the instance.
D.Create Elastic File System (EFS) and mount the file system in the instance.

Correct Answer – B
With Elastic Fabric Adapter (EFA), users can perform better than enhanced networking (Elastic Network Adapter) or Elastic Network Interface. Check the differences between EFAs and ENAs in https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/efa.html.
Option A is incorrect: Because with Elastic Fabric Adapter (EFA), users can achieve a better network performance than enhanced networking.
Option B is CORRECT: Because EFA is the most suitable method for accelerating High Performance Computing (HPC) and machine learning applications.
Option C is incorrect: Because Elastic Network Interface (ENI) cannot improve the performance as required.
Option D is incorrect: The Elastic File System (EFS) cannot accelerate the inter-instance communication.