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.

1 and 4
2 and 3
1 only
3 only

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Computer Networking
The application layer of a network

None of these
consists of software being run on the computer connected to the network
defines the user's port into the network
establishes, maintains, and terminates virtual circuits
All of these

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Computer Networking
What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?

Sends back a message to the originating station asking for a name resolution
Forwards the switch to the first available link
Drops the frame
Floods the network with the frame looking for the device

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