Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

can send or receive data one at a time
can receive and send data simultaneously
cannot talk at once
can do one way data transmission only
None of these

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Computer Networking
MAC is

None of these
network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
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

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