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?

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

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Computer Networking
Which one of the following is true regarding VLANs?

VLANs only work if you have a complete Cisco switched internetwork. No off-brand switches are allowed.
You should not have more than 10 switches in the same VTP domain.
Two VLANs are configured by default on all Cisco switches.
VTP is used to send VLAN information to switches in a configured VTP domain.

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