Computer Networking
MAC is

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

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Computer Networking
The network layer, in reference to the OSI model, provide

the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received
All of these
None of these

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