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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?

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"

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

Explanation

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