Computer Networking
Carrier is

a collection of interconnected functional units that provides a data communications service among stations attached to the network
None of these
the condition when two or more sections 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
a continuous frequency capable of being modulated or impressed with a second signal

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Computer Networking
What is route poisoning?

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

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