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

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

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Computer Networking
X.21 is

None of these
a method access control technique for multiple-access transmission media
a method of determining which device has access to the transmission medium at any time
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO

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