Review: Choosing the Minimum Number of Subnet and Host Bits
The network designer must examine the requirements for the number of subnets and number of hosts/subnet, and then choose a mask. As discussed in detail in Chapter 13, “Analyzing Subnet Masks,” a classful view of IP addresses defines the three-part structure of an IP address: network, subnet, and host. The network designer must choose the mask so that the number of subnet and host bits (S and H, respectively, in Figure 19-2) meet the requirements.
Figure 19-2 Choosing the Number of Subnet and Host Bits
Basically, the designer must choose S subnet bits so that the number of subnets that ...
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