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Refer to the exhibit. The network diagram shows two routers connected via point-to-point serial-interface. IP addresses have been configured correctly on the routers; however, pings on each side are unsuccessful. Base on the output shown, what can be concluded about the routers' configurations and what actions could be done to correct the problem?

The configurations are fine. A simple no shutdown command will put the interfaces in up/up status

Two-way CHAP authentication is being used. Remove the "ppp pap sent-username" on R1 to fix the CHAP and PAP authentication problem

One-way CHAP authentication is being used. Removal of the "ppp pap sent-username" command will fix the CHAP and PAP authentication conflict in R1

One-way CHAP authentication is being used. Pings are failing because of authentication problem caused by R2's configured username. Replace the username configured on R2 with "R1"



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