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
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
two bits or any even number of bits inverted in a byte during transmission

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Computer Networking
The network layer, in reference to the OSI model, provide

All of these
the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
the interface between the X.25 network and packet mode device

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Computer Networking
MAC is

a method access control technique or multiple-access transmission media
None of these
a very common bit-oriented data link protocol issued to ISO.
a method of determining which device has access to the transmission medium at any time
network access standard for connecting stations to a circuit-switched network

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