Computer Networking
A communications device that combines transmissions from several I/O devices into one line is a:

full-duplex line
multiplexer
concentrator
modifier
None of these

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Computer Networking
You save the configuration on a router with the copy running-config startup-config command and reboot the router. The router, however, comes up with a blank configuration. What can the problem be?

The newly upgraded IOS is not compatible with the hardware of the router.
You didn
The configuration register setting is incorrect.
NVRAM is corrupted.

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