What is CIDR notation?

CIDR (e.g., /24) indicates how many bits of the IP are used for the network portion. /24 = 255.255.255.0 subnet mask.

What is the difference between network and broadcast address?

The network address is the first IP in a subnet (identifies the network). The broadcast address is the last IP (sends data to all hosts).

The network address and broadcast address cannot be assigned to devices, so usable hosts = total - 2.

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What is CIDR notation?: CIDR (e.g., /24) indicates how many bits of the IP are used for the network portion. /24 = 255.255.255.0 subnet mask.
What is the difference between network and broadcast address?: The network address is the first IP in a subnet (identifies the network). The broadcast address is the last IP (sends data to all hosts).
Why are there 2 fewer usable hosts?: The network address and broadcast address cannot be assigned to devices, so usable hosts = total - 2.