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

All of these
the virtual circuit interface to packet-switched service
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
None of these

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Computer Networking
A T-switch is used to

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

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