Computer Networking
A required characteristic of an online real-time system is:

None of these
no delay in processing
All of these
more than one CPU
offline batch processing

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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 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.
It prevents regular update messages from reinstating a route that has just come up.

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