@yingyingzhao2012,
The command "show int | t" is abbreviated and refers to the "show interfaces" command with a modifier. The modifier ("Pipe |") is used to specify a specific portion of the output to display.
For an explanation of the "show interfaces" command output, refer to the following YouTube video link:
ActiveReach Ltd - Cisco Show Interfaces Command (00:13:36) - https://www.youtube.com/watch?v=ii8XBXoVdmw
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