Computer Networking
You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

255.240.0.0
255.254.0.0
255.252.0.0
255.255.255.255
255.248.0.0

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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?

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
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
It prevents regular update messages from reinstating a route that has gone down.
Information about a route should not be sent back in the direction from which the original update came.
It splits the traffic when you have a large bus (horizon) physical network.

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