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Computer Network 2021
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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