Computer Networking
Which of the following is required to communicate between two computers?

communications hardware
access to transmission medium
protocol
All of these
communications software

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Computer Networking
CSMA (Carrier Sense Multiple Access) is

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

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