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
3 only
1 only

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Computer Networking
The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide?

An alias for the computer name
A physical address that is assigned by the manufacturer
A logical address that identifies the workstation
The logical domain address for the workstation
A physical address that is randomly assigned each time the computer is started

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Computer Networking
Which three statements are true about the operation of a full-duplex Ethernet network?1. There are no collisions in full-duplex mode.2. A dedicated switch port is required for each full-duplex node.3. Ethernet hub ports are preconfigured for full-duplex mode.4. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.5. The host network card and the switch port must be capable of operating in full-duplex mode.

2, 3 and 4
2 and 4
5 only
1, 2, and 5

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