Computer Networking
A T-switch is used to

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

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

All of these
the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
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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