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

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

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Computer Networking
CSMA (Carrier Sense Multiple Access) is

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

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