Looking Backwards at Traditional Campus Networks
7
same physical network segment in order to share network resources. Any
deviation from this caused major headaches for the network administrators.
Figure 1.1 shows the traditional 80/20 network.
F I G U R E 1 . 1
A traditional 80/20 network
The rule that needed to be followed in this type of network was called the
80/20 rule
because 80 percent of the users' traffic was supposed to remain on
the local network segment and only 20 percent or less was supposed to cross the
routers or bridges to the other network segments. If more than 20 percent of
the traffic crossed the network segmentation devices, performance issues
arose.
Because network administrators are responsible for the network design
and implementation, network performance was improved in the 80/20 net-
work by making sure all of the network resources for the users were con-
tained within their own network segment. The resources include network
servers, printers, shared directories, software programs, and applications.
172.16.10.0
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