Which solution will meet these requirements with the LEAST operational overhead?
Create a new VPC. Associate a larger CIDR block.
Add a secondary CIDR block of 10.10.2.0/24 to the VPC.
Resize the existing VPC CIDR block from 10.10.1.0/24 to 10.10.1.0/16.
Establish VPC peering with a new VPC that has a CIDR block of 10.10.1.0/16.
Explanations:
Creating a new VPC with a larger CIDR block would require managing two separate VPCs, increasing operational overhead and complexity for network management. Additionally, resources would need to be migrated to the new VPC, which can be time-consuming.
Adding a secondary CIDR block of 10.10.2.0/24 to the existing VPC allows for immediate expansion of the IP address space with minimal operational overhead. This method enables continued use of the current VPC setup without significant changes to infrastructure.
Resizing the existing VPC CIDR block from 10.10.1.0/24 to 10.10.1.0/16 is not possible if the VPC is already in use because CIDR blocks cannot be resized to a larger range once created. This would also require downtime and a complete redesign of the IP allocation.
Establishing VPC peering with a new VPC having a CIDR block of 10.10.1.0/16 does not solve the immediate need for more IP addresses within the original VPC. While it allows communication between the VPCs, it does not provide additional IP capacity for the existing VPC.
I figure that the answer is:
Add a secondary CIDR block of 10.10.2.0/24 to the VPC.