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Which command will show you whether a DTE or a DCE cable is plugged into serial 0?

sh int s0
sh int serial 0
show controllers s 0
show serial 0 controllers

Correct Answer: show controllers s 0

Explanation:

The Show controllers serial 0 command will show you whether either a DTE or DCE cable is connected to the interface. If it is a DCE connection, you need to add clocking with the clock rate command

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