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

the virtual circuit interface to packet-switched service
the interface between the X.25 network and packet mode device
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
A T-switch is used to

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

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