1
Subnetting Stuff
2
The design process requires a choice of where to place the dashed line shown in Figure. But what is the right
choice? How many subnet and host bits should the designer choose? The answers hinge on the requirements
gathered
in the early stages of the planning process:
■
Number of subnets required
■
Number of hosts/subnet
3
Deriving the Network ID and Related Numbers
Each classful
network has four key numbers that describe the network. You can derive these
four numbers if you start with just one IP address in the network. The numbers are as follows
■
Network number
■
First (numerically lowest) usable address
■
Last (numerically hi
ghest) usable address
■
Network broadcast address
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5
6
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