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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?

R1 is using a different authentication algorithm.

There is an encapsulation mismatch.

R2 is configured with PAP authentication.

The serial interface on R2 is administratively down.

There is no username with matching password.

Explanation

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