Q382
X.21 is
A.
a method of determining which device has access to the transmission medium at any time
B.
a method access control technique for multiple-access transmission media
C.
a very common bit-oriented data link protocol issued by ISO
D.
network access standard for connecting stations to a circuit-switched network
AnswerE.
None of the above
Answer: Option D
Solution
Answer: Option D
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