ExpertMedium1 markMultiple Choice
GCP ACE · Question 39 · Domain 4.5: Managing networking resources
You have a custom-mode VPC network. One of your subnets, 'subnet-app', was created with a primary IP range of 10.0.1.0/24. You are running out of IP addresses in this subnet and need to expand it to accommodate more VMs.
What is the correct way to handle this?
You have a custom-mode VPC network. One of your subnets, 'subnet-app', was created with a primary IP range of 10.0.1.0/24. You are running out of IP addresses in this subnet and need to expand it to accommodate more VMs.
What is the correct way to handle this?
Answer options:
A.
Delete the subnet and recreate it with a larger CIDR block.
B.
Create a new subnet in the same region and bridge the two subnets together.
C.
Use the gcloud compute networks subnets expand-ip-range command to change the CIDR block to 10.0.0.0/23.
D.
Change the VPC from custom-mode to auto-mode.
How to approach this question
Know that GCP subnets can be expanded dynamically without downtime.
Full Answer
C.Use the gcloud compute networks subnets expand-ip-range command to change the CIDR block to 10.0.0.0/23.✓ Correct
In Google Cloud, you can expand the primary IP range of an existing subnet without any downtime or disruption to the resources currently using it. You use the `expand-ip-range` command (or the Console) to specify a new, larger CIDR block. The new block must completely contain the old block (e.g., expanding /24 to /23) and must not overlap with any other subnets in the VPC.
Common mistakes
Assuming you have to delete the subnet and recreate it, which is a limitation in some older on-premises networking environments but not in GCP.
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