Your organization is expanding to Europe and needs two isolated IP address spaces: 10.10.0.0/16 for us-central1 and 192.168.10.0/24 for europe-west1. Operations wants to ensure that no additional subnets are ever created automatically in other regions and that network admins can manage all future subnet CIDR ranges themselves. What is the most straightforward way to satisfy these requirements while minimizing ongoing maintenance effort?
Convert the default auto mode VPC to custom mode after deployment and periodically prune unwanted subnets as regions are added.
Keep the default auto mode VPC but run a script that deletes any subnets created in regions you do not use.
Create a new VPC in custom mode, then manually add a 10.10.0.0/16 subnet in us-central1 and a 192.168.10.0/24 subnet in europe-west1.
Use the default auto mode VPC and add the needed subnets; rely on firewall rules to keep traffic inside those ranges only.
A custom mode VPC is created without any default subnets; you add only the subnets you explicitly define. Because auto-subnet creation is disabled in custom mode networks, new Google Cloud regions will not trigger unsolicited subnet creation, giving administrators full control over all subnet CIDR ranges.
Using the default network or any auto mode VPC allows Google Cloud to pre-populate subnets for every region and to add new ones when Google introduces regions, which violates the requirement. Converting the default auto mode VPC to custom mode can work but requires additional clean-up of the pre-created subnets and adds operational overhead. Firewall rules or routing changes do not influence automatic subnet creation, so they cannot meet the stated requirement.
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What is a custom mode VPC in Google Cloud?
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Why does auto mode VPC create subnets automatically for all regions?
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What is the difference between an auto mode VPC and a custom mode VPC?
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Why is a custom mode VPC preferred over auto mode in this scenario?
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What is the difference between custom mode and auto mode in VPCs?
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How do subnet CIDR ranges work in Google Cloud VPC networks?
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