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

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

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Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

can send or receive data one at a time
None of these
cannot talk at once
can do one way data transmission only
can receive and send data simultaneously

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