Figure

Binary representation

128

64

32

16

8

4

2

1

1

1

1

1

1

0

0

0

As each octet is represented in its barest form as a binary number, you can make a comparison of a network mask to a subnet mask.

You can see in Figure 6-5 that a subnet mask is, in fact, a further extension of the network mask at the sacrifice of the host portion of the IP address. We are using four bits of the host address, which takes the amount of hosts in a Class C address (254) down to 14 per network (of which there can be 16 networks).

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