A cloud architect converts an existing auto-mode VPC to custom mode to get finer subnet control. What behavior will occur after conversion?
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Correct answer: Existing automatically created subnets remain in place, but no new automatic subnets will be created thereafter..
Why this is the answer
When an auto-mode VPC is converted to custom mode, all existing automatically created subnets are preserved and continue to function normally. This ensures no disruption to running services. However, because the VPC is now in custom mode, Google Cloud will no longer automatically create new subnets in new regions as they become available. You gain full manual control over subnet creation and IP range allocation. The other options are incorrect: subnets are not deleted, the VPC remains a single global resource, and VM instances are not automatically migrated; they stay within their original subnets.
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