Computer Networking
ICMP (Internet Control Message Protocol) is

a TCP/IP high level protocol for transferring files from one machine to another
None of these
a protocol that handles error and control messages
a protocol used to monitor computers
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address

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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 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.

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