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?

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

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Computer Networking
Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

Network collisions occur
Cable terminators do not reflect the signal properly
"Line echo" occurs due to the impedance of the cable
Cable terminators do not absorb the signal properly
Repeaters cannot increase the signal strength sufficiently

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