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Which of the following commands can be used to verify the PPP configuration on a serial interface, check its current status, and see its performance statistics & errors for the last 5 minutes?
show running configuration
show serial0/0 output ppp
show ppp interfaces detail
show interface serial0/0 tech-support
show controllers seria0/0
show interface serial0/0
The command "show interface serial" shows the encapsulation (whether is PPP or HDLC), and can also display the PPP network protocols such as LCP or NCP. For more information refer to: http://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/14149-chapter15.html For more information refer to: http://en.wikipedia.org/wiki/Point-to-Point_Protocol
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