In the previous chapter, you configured a Cisco router such that it connects to the network and can be managed remotely amongst other things. Now it is finally the time to look at the single most important function of routers – IP routing. As you already know, routers look at the destination IP address of a packet and route it to the destination. Though the routing process itself is easy, building a list of networks, called the routing table, is not as easy. This chapter looks at the IP routing process itself and various ways to build to the routing table.