One of the biggest problems that new administrators face is the interface names on the different models of routers. With all of the different Cisco devices that are in production networks today, some administrators are becoming confused on 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