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After setting up a serial interface on router R1, the communication cannot be established with the peer end.
You issue the command: "show controllers s0", and on the third line it says: "DCE V.35"
Which of the following commands is most likely to solve the issue on the local router R1?

R1(config-if)#clockrate 64

R1(config-if)#clockrate 64000

R1(config-if)#bandwidth 64

R1(config-if)#bandwidth 64000

Explanation

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