Computer Networking
Communication network is

None of these
a continuous frequency capable of being modulated or impressed with a second signal
the condition with 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
one or more conductors that serve as a common connection for a related group of devices

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Computer Networking
What is route poisoning?

It is information received from a router that can't be sent back to the originating router.
It prevents regular update messages from reinstating a route that has just come up.
It sends back the protocol received from a router as a poison pill, which stops the regular updates.
It describes when a router sets the metric for a downed link to infinity.

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