A company has a legacy-based software that needs to be transferred to the AWS cloud. The legacy-based software has a dependency on the license which is based on the MAC Address. What would be a possible solution to ensure that the legacy-based software will always work properly and not lose the MAC address at any point in time? Choose an answer from the below options.

Answer options:

A.Ensure any EC2 Instance that you deploy has a static IP address mapped to the MAC address.
B.Use a VPC with a private subnet for the license and a public subnet for the EC2.
C.Use a VPC with a private subnet and configure the MAC address to be tied to that subnet.
D.Use a VPC with instances having an elastic network interface attached that has a fixed MAC Address.

Answer – D
Option A is incorrect because you cannot map a static IP address to a MAC address.
Option B is incorrect because putting a license server in a private subnet would not resolve the dependency on the license based on a MAC address.
Option C is incorrect because MAC addresses cannot be tied to subnets.
Option D is CORRECT because you should use the Elastic Network Interface associated with a fixed MAC address. This will ensure that the legacy license-based software would always work and not lose the MAC address at any point in the future.
For more information on Elastic Network Interfaces, please refer to the URL below.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html