Computer Networking
Why does the data communication industry use the layered OSI reference model?1. It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.2. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.3. It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.4. It encourages industry standardization by defining what functions occur at each layer of the model.

2 and 3
1 and 4
1 only
3 only

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Computer Networking
Contention is

a collection of interconnected functional units that provides a data communications service among stations attached to the network
None of these
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
One or more conductors that serve as a common connection for a related group of devices

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