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4-18 1. Ethernet
Subnet Mask
A subnet mask is used for dividing one network address into multiple networks (subnet).
The subnet is assigned by specifying a part of the host address in the IP address as a subnet
address.
255. 255.
255.
0
10
11111111
11111111 11111111 00000000
Class B
Subnet mask
Host address (16)
Network address Subnet address
Network address (14)
Host address