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 describes when a router sets the metric for a downed link to infinity.
It sends back the protocol received from a router as a poison pill, which stops the regular updates.

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Computer Networking
The network layer, in reference to the OSI model, provide

the virtual circuit interface to packet-switched service
None of these
All 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

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