T
his chapter will discuss the IP routing process. This is an
important subject to understand, as it pertains to all routers and configura-
tions that use IP. IP routing is the process of moving packets from one
network to another network using routers.
Before you read this chapter, you must understand the difference between
a routing protocol and a routed protocol. A
routing protocol
is used by rout-
ers to dynamically find all the networks in the internetwork and to make sure
that all routers have the same routing table. Basically, a routing protocol
determines the path of a packet through an internetwork. Examples of rout-
ing protocols are RIP and IGRP.
Once all routers know about all networks, a
routed protocol
can be used
to send user data (packets) through the internetwork. Routed protocols
are assigned to an interface and determine the method of packet delivery.
Examples of routed protocols are IP and IPX.
It is imperative to understand that this is a very, very important chapter
to comprehend. IP routing is what Cisco routers basically do, and they do
this very well.
In this chapter, I'll tell you how to configure and verify IP routing with
Cisco routers. I'll cover the following:
Static routing
Default routing
Dynamic routing
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