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

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
All of these
None of these

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Computer Networking
Error rate is

a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of all the binary digits.
an error-detecting code based on a summation operation performed on the bits to be checked.
None of these
the ratio of the number of data units in error to the total number of data units

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Computer Networking
Bandlimited signal is

transmission of signals without modulation
None of these
simultaneous transmission of data to a number of stations
All of these
a signal all of whose energy is contained within a finite frequency range

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