Computer Networking
What is route poisoning?

It prevents regular update messages from reinstating a route that has just come up.
It is information received from a router that can't be sent back to the originating router.
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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Computer Networking
The physical layer, in reference to the OSI model, defines

the virtual circuit interface to packet-switched service
None of these
data link procedures that provide for the exchange of data via frames that can be sent and received
the interface between the X.25 network and packet mode device
All of these

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