You have a custom VPC with a subnet `10.0.0.0/24`. You are running out of IP addresses in this subnet and need to expand it to `10.0.0.0/20`. There are running VMs in the subnet. Which command should you use?

Answer options:

gcloud compute networks subnets update ... --range=10.0.0.0/20

gcloud compute networks subnets expand-ip-range ... --prefix-length=20

You must delete the subnet and recreate it with the new range.

You must stop all VMs before expanding the subnet.

How to approach this question

Remember the specific gcloud command for expanding subnets and that it can be done dynamically.

Full Answer

B.gcloud compute networks subnets expand-ip-range ... --prefix-length=20✓ Correct

gcloud compute networks subnets expand-ip-range

In Google Cloud, you can expand the IP range of an existing subnet without any downtime or impact to running VMs. The command is `gcloud compute networks subnets expand-ip-range [SUBNET_NAME] --prefix-length=20`. You cannot shrink a subnet, only expand it.

Common mistakes

Believing that network changes require VM downtime or subnet recreation.

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