Question

You are designing a new production VPC for a company that will initially deploy workloads in us-central1 and europe-west1, with plans to add three more regions over the next two years. The network team requires strict control over which subnet CIDR ranges exist in each region and wants to avoid any automatically created subnets that could later overlap with on-premises ranges reachable over Cloud Interconnect. Which VPC design best meets these requirements?

Accepted Answer

Create a custom mode VPC and manually define subnets with explicitly chosen CIDR ranges only in the regions you intend to use.

Answer

Create an auto mode VPC, then delete the subnets in unused regions to prevent CIDR overlap with on-premises networks.

Answer

Create an auto mode VPC because it automatically assigns non-overlapping ranges and later convert it to custom mode when adding regions.

Answer

Create a custom mode VPC and enable auto-subnet creation so new regions receive predefined 10.128.0.0/9 ranges as they launch.