Computer Networking
Bus is

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

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

None of these
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

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