|  | 6.2 | Router Configuration Modes
| 6.2.5 | Configuring a specific interface
The Figure shows commands that are examples of how to complete common interface tasks. The first set of commands is associated with interfaces. On serial links, one side must provide a clocking signal, a DCE; the other side is a DTE. By default, Cisco routers are DTE devices, but in some cases they can be used as DCE devices. If you are using an interface to provide clocking, you must specify a rate with the clockrate command. The bandwidth command overrides the default bandwidth that is displayed in the show interfaces command and is used by some routing protocols such as IGRP. The second set of commands is associated with the Cisco 4000 series routers. On the Cisco 4000, there are two connections on the outside of the box for Ethernet interfaces-an attachment unit interface (AUI) connector and a 10BASE-T connector. The default is AUI, so you must specify media-type 10BASE-T if you want to use the other connection.
| Lab Activity
| In this lab you will use the router’s interface configuration mode to configure an IP address and subnet mask for each router interface.