Question

You are designing a new production VPC for a retail company. The network must connect to two on-premises data centers via HA VPN, and the on-premises teams have already allocated the 10.128.0.0/9 range for their infrastructure. The cloud team wants precise control over which regions have subnets and the exact CIDR ranges used, to avoid any overlap with on-premises addressing. Which VPC design should you choose?

Accepted Answer

Create a custom mode VPC and manually define subnets only in the regions you need with non-overlapping CIDR ranges.

Answer

Create an auto mode VPC so subnets are automatically provisioned in every region with predefined ranges.

Answer

Create an auto mode VPC and rely on custom routes to prevent overlap with the on-premises 10.128.0.0/9 range.

Answer

Create a custom mode VPC but let Google auto-assign secondary ranges to guarantee no overlap.