Network
Host
Size: 8, 16, 24 (A, B, C)
Mask 0s
Mask 1s
Subnet
Figure 13-6
Class Concepts Applied to Create Three Parts
The combined network and subnet parts act like the prefix because all addresses in the same
subnet must have identical values in the network and subnet parts. The size of the host part
remains unchanged, whether viewing the addresses as having two parts or three parts.
To be complete, Figure 13-7 shows the same example as in the previous section, with the
subnet of “all addresses that begin with 10.1.1.” In that example, the subnet uses mask
255.255.255.0, and the addresses are all in Class A network 10.0.0.0. The class defines 8 net-
work bits, and the mask defines 24 prefix bits, meaning that 24 – 8 = 16 subnet bits exist.
The host part remains as 8 bits per the mask.
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