One of the biggest problems that new administrators face is the interface names on the different models of routers. With all the different Cisco devices in production networks today, some administrators are becoming confused about the names of their interfaces. The following chart is a sample of some of the different interface names for various routers.
This is by no means a complete list. Refer to the hardware guide of the specific router that you are working on to see the different combinations, or use the following command to see which interfaces are installed on your particular router:
router#show ip interface brief
Moving Between Interfaces
What happens in Column 1 is the same thing occurring in Column 3.
Configuring a Serial Interface
TIP: The clock rate command is used only on a serial interface that has a DCE cable plugged into it. There must be a clock rate set on every serial link between routers. It does not matter which router has the DCE cable plugged into it or which interface the cable is plugged into. Serial 0 on one router can be plugged into Serial 1 on another router.
Configuring a Fast Ethernet Interface
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