Your company has set up a series of EC2 Instances in a VPC. There is now a requirement to set up a management network inside of the VPC. Which of the following will be part of the implementation steps?

Answer options:

A.Attach multiple Elastic Network Interfaces to an Instance.
B.Attach multiple public IP addresses to an existing Elastic Network Interface for instance.
C.Attach multiple Elastic IP addresses to an existing Elastic Network Interface for instance.
D.Attach multiple private IP addresses to an existing Elastic Network Interface for instance.

Answer – A
The AWS Documentation mentions the following to support this.
Attaching multiple network interfaces to an instance is useful when you want to:
· Create a management network.
· Use network and security appliances in your VPC.· Create dual-homed instances with workloads/roles on distinct subnets.
· Create a low-budget, high-availability solution.
All other options automatically are invalid since the primary implementation step is to create multiple ENI’s
For more information on Elastic Network Interfaces, please refer to the below URL
https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ElasticNetworkInterfaces.html
Creating a Management Network
You can create a management network using network interfaces. In this scenario, the primary network interface (eth0) on the instance handles public traffic, and the secondary network interface (eth1) handles backend management traffic. It is connected to a separate subnet in your VPC that has more restrictive access controls. The public interface, which may or may not be behind a load balancer, has an associated security group that allows access to the server from the internet (for example, allow TCP port 80 and 443 from 0.0.0.0/0, or from the load balancer) while the private facing interface has an associated security group allowing SSH access only from an allowed range of IP addresses either within the VPC or from the internet, a private subnet within the VPC or a virtual private gateway.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html#AvailableIpPerENI