Your company has a custom VPC with a subnet named 'app-subnet' using the IP range 10.0.0.0/24. You have run out of IP addresses in this subnet and need to expand it to a /20 range without recreating the subnet or disrupting existing VMs.

Which command should you use?

Answer options:

gcloud compute networks subnets update app-subnet --range=10.0.0.0/20

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

gcloud vpc subnets resize app-subnet --cidr=10.0.0.0/20

You cannot expand a subnet; you must create a new one and migrate the VMs.

How to approach this question

Recall the specific gcloud command used to increase the size of a subnet.

Full Answer

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

In GCP, you can dynamically expand the IP range of a subnet without downtime, provided the new range does not overlap with other subnets. The correct command is `gcloud compute networks subnets expand-ip-range [SUBNET_NAME] --prefix-length=[NEW_PREFIX]`.

Common mistakes

Believing that subnets cannot be resized, or using the 'update' command instead of 'expand-ip-range'.

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