Computer Networking
Which of the following condition is used to transmit two packets over a medium at the same time?

Asynchronous
Synchronous
None of these
Contention
Collision

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Computer Networking
MAC is

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

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