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Which command can be used to determine the type of cable attached to a serial interface?
show interfaces
show ip interface
show controllers
show running-config
To verify the cable that is attached to the serial interface, to check the CSU/DSU and the telephone company network termination point use the "show controllers". For more information refer to: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1915.html
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