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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?
Large amount of errors.
Loopback is not set.
Cable is damaged.
Encapsulation mismatch.
No authentication is set.
HDLC is the default encapsulation method for Cisco routers. If a router is left with default values, the serial interface will have HDLC as the encapsulation method. Router R1 has PPP as encapsulation method; therefore it is an encapsulation mismatch problem.
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