Computer Networking
MAC is

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

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Computer Networking
The main difference between synchronous and asynchronous transmission is

the bandwidth required is different
the clocking is derived from the data in synchronous transmission
the clocking is mixed with the data in asynchronous transmission
None of these
the pulse height is different.

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Computer Networking
The physical layer, in reference to the OSI model, defines

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

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