Discussion :: Networking
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X.21 is
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A.
a method of determining which device has access to the transmission medium at any time
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B.
a method access control technique for multiple-access transmission media
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C.
a very common bit-oriented data link protocol issued by ISO
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D.
network access standard for connecting stations to a circuit-switched network
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E.
None of the above
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Answer : Option D
Explanation :
No answer description available for this question.
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