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Chapter (3) Networking Media and Data Link Layers Protocols
Figure 4-23 shown an Addressing with Subnet
Figure 4-24 shown a Usage of Subnet Address
The system administrator must resolve these issues when adding and expanding the
network. It is important to know how many subnet/networks are needed and how many hosts
are allowed to be on each network. With subnetting, the network is not limited to the standard
Class A, B, or C network masks and there is more flexibility in the network design.
Subnet addresses include the Class A, Class B, or Class C network portion, plus a Subnet
field and a Host field. These fields are created from the original host portion for the entire
network. The ability to decide how to divide the original host portion into the new Subnet and
Host fields provides addressing flexibility for the network administrator. To create a subnet
address, a network administrator borrows bits from the Host field and designates them as the
Subnet field, as shown in Table 4-5.
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