Final answer:
When you increase the size of a subnet in a custom VPC network, the IP addresses of virtual machines already on that subnet might be affected.
Step-by-step explanation:
The statement is true. When you increase the size of a subnet in a custom VPC network, the IP addresses of virtual machines already on that subnet might be affected.
This is because when you increase the size of a subnet, you are expanding the range of available IP addresses. This means that the existing virtual machines may need to be reassigned IP addresses within the new range.
For example, if you had a subnet with IP addresses ranging from 10.0.0.1 to 10.0.0.10 and you increased the subnet size to allow more addresses, existing virtual machines may be given new IP addresses like 10.0.0.11 or higher.