Information Technology Reference
In-Depth Information
fIgure 8.3
A sample subnet
The Internet
1.
This router needs only one
entry for Widget Inc.
Router D
Subnet 1
Subnet 2
Router A
Widget Inc.
130.57
Router B
Subnet 4
Subnet 3
Router C
fIgure 8.4
Network vs. host addresses
Class B address
Network address
Host address
130.57.
1.56
1000 0010. 0011 10 01.
0000 0001. 0011 10 00
Class B address with a subnet address
Network address
Subnet
Host address
1000 0010. 0011 10 01.
0000 0001. 0011 10 00
Because the Widget Inc. network is a Class B network, the first two bytes specify
the network address and are shared by all machines on the network, regardless of their
particular subnet. Here every machine's address on the subnet must have its third byte
read 0000 0001. The fourth byte, the host address, is the unique number that identifies the
actual host within that subnet. Figure 8.5 illustrates how a network address and a subnet
address can be used together.
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