Which subnet mask should you use for the Pod IP address range?

You need to define an address plan for a future new GKE cluster in your VPC. This will be a VPC native cluster, and the default Pod IP range allocation will be used. You must pre-provision all the needed VPC subnets and their respective IP address ranges before cluster creation. The cluster will initially have a single node, but it will be scaled to a maximum of three nodes if necessary. You want to allocate the minimum number of Pod IP addresses.

Which subnet mask should you use for the Pod IP address range?
A . /21
B . /22
C . /23
D . /25

Answer: B

Explanation:

https://cloud.google.com/kubernetes-engine/docs/how-to/alias-ips#cluster_sizing_secondary_range_pods

Reference: https://cloud.google.com/kubernetes-engine/docs/how-to/alias-ips https://cloud.google.com/kubernetes-engine/docs/how-to/flexible-pod-cidr https://cloud.google.com/kubernetes-engine/docs/concepts/alias-ips#defaults_limits