- A subnet mask separates the IP address into the network and host addresses.
- Subnet Mask is made by setting network bits to all "1"s and setting host bits to all "0"s.
- Within a given network, two host addresses are reserved for special purpose, and cannot be assigned to hosts. The "0" address is assigned a network address and "255" is assigned to a broadcast address, and they cannot be assigned to hosts.
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