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Which of the following commands is used to enable CHAP authentication before PAP on a WAN point-to-point link?
R1(config-if)# ppp authentication chap pap
R1(config)# ppp authentication chap pap
R1(config-if)# ppp authentication pap chap
R1(config)# ppp authentication pap chap
Authentication for PPP must be enabled on an interface level. PPP can be configured with pap and chap at the same time. If CHAP is needed to be the first authentication for the link followed by pap issue the command R1(config-if)# ppp authentication chap pap. If otherwise pap needs to be the first issue the command R1(config-if)# ppp authentication pap chap.
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