Computer Networking
What is split horizon?

It prevents regular update messages from reinstating a route that has gone down.
Information about a route should not be sent back in the direction from which the original update came.
It splits the traffic when you have a large bus (horizon) physical network.
It holds the regular updates from broadcasting to a downed link.

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Computer Networking
A T-switch is used to

transmit characters one at a time
control how messages are passed between computers
None of these
rearrange the connections between computing equipment
echo every character that is received

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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 only
1 and 4
3 only
2 and 3

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