One of your colleagues, who is new to the company where you work as a cloud Architect, has some issues with IP Addresses. He has created an Amazon VPC with an IPV4 CIDR block 10.0.0.0/24, but now there is a requirement of hosting a few more resources to that VPC. As per his knowledge, he is thinking of creating a new VPC with a greater range. Could you suggest to him a better way that should be reliable?

Answer options:

A.Delete the existing subnets in the VPC and create new Subnets in VPC.B.He is thinking of the right approach.
C.You can create new VPC and connect old VPC with a new one.
D.You can expand existing VPC by adding Secondary CIDR to your current VPC.

Correct Answer - D
Options A, B, C are incorrect because it is not reliable to go for this type of approach as VPC to VPC connection will take new resources like VPC Peering. Creating a new VPC or Subnet is also not suggested.
Option D is correct because you can associate Secondary CIDR to your current VPC to accommodate more hosts.
Refer: https://docs.aws.amazon.com/vpc/latest/userguide/working-with-vpcs.html#add-ipv4-cidr