Computer Networking
Bulletin board system

converts analog signals to digital signals
is a modem capable of accepting commands
None of these
is a public access message system
converts digital signals to analog signals

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Computer Networking
The data-link layer, in reference to the OSI model, specifies

None of these
the interface between the X.25 network and packet mode device
All of these
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

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