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

Contention
Asynchronous
None of these
Collision
Synchronous

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Computer Networking
X.21 is

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

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