N=16
S=__
H=__
B
N + S + H = 32
B
Set by Local
Engineer
Set By
Class B Rules
Figure 23-5
Classful View of Subnetted IPv4 Networks
IPv6 uses a similar concept, with the details in Figure 23-6. The structure shows three major
parts, beginning with the global routing prefix, which is the initial value that must be the
same in all IPv6 addresses inside the enterprise. The address ends with the interface ID,
which acts like the IPv4 host field. The subnet field sits between the two other fields, used as
a way to number and identify subnets, much like the subnet field in IPv4 addresses.
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