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

None of these
the probability that one or more errors will be detected when an error detection mechanism 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
The probability that one or more errors will be undetected when an error detection scheme is used

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Computer Networking
In geosynchronous orbit, satellite

moves simultaneously
remains in a fixed position related to points on earth
remains in a fixed position so that as earth rotates, it can fully cover the earth
moves faster than the earth's rotation so that it can cover larger portion of earth.
None of these

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Computer Networking
The difference between a multiplexer and a statistical multiplexer is

Multiplexers use Time Division Multiplexing (TDM) while statistical multiplexers use Frequency Division Multiplexing (FDM)
Multiplexers often waste the output link capacity while statistical multiplexers optimize its use
Statistical multiplexers need buffers while multiplexers do not need buffers
None of these
Multiplexer use X.25 protocol, while statistical multiplexers use the Aloha protocol

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