Computer Science - Networking - Discussion

Discussion Forum : Networking - Section 7 (Q.No. 40)
40.
X.21 is
a method of determining which device has access to the transmission medium at any time
a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
None of the above
Answer: Option
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