Computer Networking
Contention is

a continuous frequency capable of being modulated or impressed with a second signal
the condition when two or more stations attempt to use the same channel at the same time
a collection of interconnected functional units that provides a data communications service among stations attached to the network
None of these
One or more conductors that serve as a common connection for a related group of devices

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Computer Networking
CSMA (Carrier Sense Multiple Access) is

None of these
a very common bit-oriented data link protocol issued by ISO.
a method access control technique for multiple-access transmission media.
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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