Computer Networking
A remote batch-processing operation in which data is solely input to a central computer would require a:

telegraph line
All listed here
simplex lines
None of these
mixedband channel

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Computer Networking
RS-449/442-A/423-A is

None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
a set of physical layer standards developed by EIA and intended to replace RS-232-
the ratio of the number of data units in error to the total number of data units
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and

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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?

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

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Computer Networking
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Flood the network with the frame
Add the source address and port to the MAC address table and forward the frame out the destination port
Discard it and send an error message back to the originating host
Add the destination to the MAC address table and then forward the frame

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