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I'm very new to networking. I noticed in GNS3 lab environment, if I want to configure IP address for an interface of a router, I can use int f0/0 or int fastEthernet 0/0. What's the naming rule here? I can't find related information in the document.

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All Cisco commands can be abbreviated. You have to type enough of the command so that it is unambiguous. You can type

interface

interf

or just

int

It's the same for interface names:

f0/0 is the same as fa0/0 or fastethernet0\0

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  • fastEthernet or simply f is a 10/100 Mbit/s Ethernet interface, g 10/100/1000 Mbit/s, and so on
  • the 0/0 specifies the module number and the port number within the module
  • with stacked/multi-chassis switches, the first number in 0/0/0 denotes the chassis
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