CCNA Cisco Certified Network Associate (#690)

Section: Version 2.0

Which command is used to enable CHAP authentication, with PAP as the fallback method, on a serial interface?

Router(config-if)# ppp authentication chap fallback ppp
Router(config-if)# ppp authentication chap pap
Router(config-if)# authentication ppp chap fallback ppp
Router(config-if)# authentication ppp chap pap