Discussion
Which command will show you whether a DTE or a DCE cable is plugged into serial 0?
Answer: C
Correct answer: show controllers serial 0
show controllers reports at the physical layer, below the interface, and its output states whether a DTE or a DCE cable is attached - and if DCE, what clock rate is set. That matters on a back-to-back laboratory link, where the DCE end must supply the clock or the line protocol will never come up. show interface reports the line and protocol status but not the cable type.
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