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

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

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Computer Networking
RS-232-G

None of these
requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
is an interface between two data circuit terminating equipment as examplified by a local and remote modem
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
specifies only the mechanical characteristics of an interface by providing a 25-pin connector

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