Computer Networking
Communication network is

one or more conductors that serve as a common connection for a related group of devices
None of these
the condition with two or more stations attempt to use the same channel at the same time
a collection of interconnected functional units that provides a data communications service among stations attached to the network
a continuous frequency capable of being modulated or impressed with a second signal

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

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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