Final answer:
The question involves calculating the number of subnets, usable IP addresses, and identifying the CIDR block given a subnet mask, within the field of Computers and Technology at a College level.
Step-by-step explanation:
The correct answer is option Computers and Technology. When given a subnet mask, you can determine the number of subnets/networks, the number of usable IP addresses or hosts, and the corresponding CIDR block.
The number of subnets can be calculated from the number of bits used for subnetting in the mask. Similarly, the number of usable IP addresses is derived by subtracting 2 addresses (network and broadcast addresses) from the total number of addresses in the subnet.
The CIDR block notation combines the IP address and subnet mask to simplify routing.