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?

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

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Computer Networking
TCP is:

Connection orientated and unreliable
Connectionless and unreliable
None of these
Connection orientated and reliable
Operates at the Data Link layer

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