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 block during transmission
one bit or any odd number of bits inverted in a block of data 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 byte during transmission

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Computer Networking
Demodulation is the process of

converting analog signals to digital signals
combining many low speed channels into one high speed channel
None of these
dividing the high-speed signals into frequency bands
converting digital signals to analog signals

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