Computer Networking
What is the main reason the OSI model was created?

So Cisco could use the model.
To create a layered model larger than the DoD model.
So different networks could communicate.
So application developers can change only one layer's protocols at a time.

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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.
NVRAM is corrupted.
The configuration register setting is incorrect.
You didn

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Computer Networking
RS-232-G

specifies only the mechanical characteristics of an interface by providing a 25-pin connector
requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
None of these
is an interface between two data circuit terminating equipment as examplified by a local and remote modem

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