Computer Networking
Which of the following refers to the terms "residual error rate"?

the probability that one or more errors will be detected when an error detection mechanism is used
The probability that one or more errors will be undetected when an error detection scheme is used
signal to noise ratio divided by the ratio of energy per bit to noise per hertz
the number of bit errors per twenty four hours of continuous operation on an asynchronous line
None of these

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Computer Networking
Demodulation is the process of

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

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Computer Networking
You want to create a standard access list that denies the subnet of the following host: 172.16.50.172/20. Which of the following would you start your list with?

access-list 10 deny 172.16.48.0 0.0.15.255
access-list 10 deny 172.16.0.0 0.0.255.255
access-list 10 deny 172.16.48.0 255.255.240.0
access-list 10 deny 172.16.64.0 0.0.31.255

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Computer Networking
Bulletin board system

None of these
converts analog signals to digital signals
is a modem capable of accepting commands
converts digital signals to analog signals
is a public access message system

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