Computer Networking
Error detecting code is

the ratio of the data units in error to the total number of data units
a code in which each expression conforms to specify rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
an error-detecting code based on a summation operation performed on the bits to be checked
a check bit appended to an array of binary digits to make the sum of all the binary digits.
None of these

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Computer Networking
Demodulation is the process of

combining many low speed channels into one high speed channel
converting digital signals to analog signals
converting analog signals to digital signals
None of these
dividing the high-speed signals into frequency bands

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

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