Computer Networking
Operating system functions may include

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

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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
All of these
the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device
None of these

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