ASSOCIATE-CLOUD-ENGINEER Question #38: Real Exam Question with Answer & Explanation

Question

You have created a subnet named subnetace1 with 16,382 addresses using 192.168.0.0. Later you realize that you won't require too many addresses, and so you want to reduce addresses to 254. Which of the following command would you use?

Options

• Agcloud compute networks subnets expand-ip-range subnetace1 --prefix-length=28
• Bgcloud compute networks subnets expand-ip-range subnetace1 --size=248
• Cgcloud compute networks subnets expand-ip-range subnetace1 --prefix-length=-12
• DThere is no command in google cloud to reduce the number of available addresses in a subnet.

Explanation

Google Cloud Platform allows expanding the IP range of an existing subnet, but there is no direct command or feature to reduce the IP address range once it has been created.

Common mistakes.

• A. The expand-ip-range command is used to increase the size of a subnet, not decrease it, and specifying --prefix-length=28 for an existing range would not reduce it if the original range was larger.
• B. The expand-ip-range command is used to increase the size of a subnet, not decrease it, and the --size flag is not a valid parameter for specifying subnet size reduction.
• C. The expand-ip-range command is for increasing the subnet size, not decreasing it, and a negative prefix length value is not a valid parameter.

Concept tested. Subnet IP range management

Reference. https://cloud.google.com/vpc/docs/create-expand-subnets

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