Which solution resolves this issue with the LEAST operational overhead?
Add an additional IPv4 CIDR block to increase the number of IP addresses and create additional subnets in the VPC. Create new resources in the new subnets by using the new CIDR.
Create a second VPC with additional subnets. Use a peering connection to connect the second VPC with the first VPC Update the routes and create new resources in the subnets of the second VPC.
Use AWS Transit Gateway to add a transit gateway and connect a second VPC with the first VPUpdate the routes of the transit gateway and VPCs. Create new resources in the subnets of the second VPC.
Create a second VPC. Create a Site-to-Site VPN connection between the first VPC and the second VPC by using a VPN-hosted solution on Amazon EC2 and a virtual private gateway. Update the route between VPCs to the traffic through the VPN. Create new resources in the subnets of the second VPC.
Explanations:
Adding an additional IPv4 CIDR block allows for an increase in the available IP address range within the existing VPC. This approach has minimal operational overhead as it does not require managing multiple VPCs or complex networking setups. New subnets can be easily created, and existing resources can remain operational without significant changes.
Creating a second VPC requires setting up a peering connection, which introduces additional management complexity and operational overhead. It involves maintaining routes and managing two separate VPCs, which is not the most efficient solution when the existing VPC can simply be expanded.
Using AWS Transit Gateway adds complexity and operational overhead by requiring configuration of a transit gateway to connect two VPCs. This option also necessitates route updates and ongoing management of the transit gateway and peering connections, making it more cumbersome compared to simply expanding the existing VPC.
Creating a second VPC and establishing a Site-to-Site VPN connection adds significant operational overhead. It involves managing two separate VPCs and a VPN connection, which complicates the network architecture and increases the administrative burden, making it a less desirable solution for the IP address limitation issue.
I calculate that the answer is:
Add an additional IPv4 CIDR block to increase the number of IP addresses and create additional subnets in the VPC. Create new resources in the new subnets by using the new CIDR.