Computer Networking
Error detection at a data link level is achieved by

cyclic redundancy codes
Hamming codes
None of these
bit stuffing
equalization

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Computer Networking
Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

None of these
two bits or any even number of bits inverted in a byte during transmission
one bit or any odd number of bits inverted in a byte during transmission
two bits or any even number of bits inverted in a block during transmission
one bit or any odd number of bits inverted in a block of data during transmission

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Computer Networking
Baseband is

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

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