Your team will create subnets for a single VPC in three regions. Which constraint must you observe when assigning IPv4 ranges for those subnets?
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Correct answer: Subnets in the same VPC must not have overlapping IP ranges across regions..
Why this is the answer
In Google Cloud, all subnets within a single Virtual Private Cloud (VPC) network must have unique, non-overlapping IPv4 ranges, regardless of the region they are in. This is a fundamental design principle of VPC networks, ensuring proper routing and preventing IP address conflicts. If IP ranges overlapped, the network would not know where to send traffic for a given IP address. Cloud Router facilitates dynamic routing but does not allow overlapping IP ranges within the same VPC. Subnet sizes are flexible and not restricted to /16. Reusing RFC1918 ranges in different regions within the same VPC will cause conflicts and is not allowed.
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