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It is believed that a PPP authentication issue is causing a dialup link failure. Which of the following commands can be used for troubleshooting this issue?
debug authentication ppp
show dialup-link ppp
debug ppp negotiation
show interface serial 0/0
To troubleshooting PPP (CHAP or PPP) authentication issues use the following two debug commands: "debug ppp negotiation" and "debug ppp authentication". For more information refer to: http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25646-ppp-authen-ts-fl.htmlhttp://en.wikipedia.org/wiki/Point-to-Point_Protocol
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