Computer Networking
Operating system functions may include

input/output control
All of these
multiprogramming
None of these
virtual storage

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

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

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