Computer Networking
In OSI network architecture, the dialogue control and token management are responsibilities of

None of these
session layer
data link layer
network layer
transport layer

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Computer Networking
X.21 is

a very common bit-oriented data link protocol issued by ISO
network access standard for connecting stations to a circuit-switched network
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
None of these

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