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Refer to the exhibit. Router "R1" is connected through a serial interface to router "R2", which has been left with default parameters. The IP addressing is correct on both sides, but there is a problem on the communication. What can be the cause of the problem?

Loopback is not set.

Large amount of errors.

Cable is damaged.

Encapsulation mismatch.

No authentication is set.

Explanation

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