Computer Networking
Which of the following device is used with an X.25 network to provide service to asynchronous terminals

Packet assembler/disassemble
gateway
None of these
repeater
bridges

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Computer Networking
Modulation is the process of

performing data encryption.
Multiplexing various signals into high speed line signals
converting digital signals to analog signals
converting analog signals to digital signals

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

The probability that one or more errors will be undetected when an error detection scheme is used
the number of bit errors per twenty four hours of continuous operation on an asynchronous line
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

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