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Refer to the exhibit. Routers R1 and R2 have been configured with PPP. CHAP authentication is configured, but for some reason communication cannot be established between them.

The command: "debug ppp authentication" is executed on router R1. What is most likely to be the issue?

There is an encapsulation mismatch.

R2 is configured with PAP authentication.

The serial interface on R2 is administratively down.

R1 is using a different authentication algorithm.

There is no username with matching password.



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