Understanding Topology and Router Configurations
This section contains the original router configurations used for most of the examples in this book. Any time a change is made to one of these configurations in a subsequent chapter, a note is provided indicating what was changed and why.
Figure 1-4 shows the basic topology used unless otherwise noted. This three-router design uses the minimum number of routers required to present some fairly complex concepts. Adding additional routers is only necessary in a few instances, in which three routers are not sufficient to create a particular scenario.
Figure 1-4. Basic topology for most scenarios.
In the network diagrams, SO and SI are used as shorthand for Serial Interface 0 and Serial Interface ...
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