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
None of these
All 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
A T-switch is used to

rearrange the connections between computing equipment
control how messages are passed between computers
None of these
transmit characters one at a time
echo every character that is received

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Computer Networking
Bus is

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
the condition when two or more stations attempt to use the same channel at the same time
None of these
a continuous frequency capable of being modulated or impressed with a second signal

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