Computer Networking
A T-switch is used to

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

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

None of these
the interface between the X.25 network and packet mode device
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

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