Computer Networking
Carrier is

a continuous frequency capable of being modulated or impressed with a second signal
None of these
the condition when two or more sections attempt to use the same channel at the same time
One or more conductors that serve as a common connection for a related group of devices
a collection of interconnected functional units that provides a data communications service among stations attached to the network

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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 undetected when an error detection scheme is used
the probability that one or more errors will be detected when an error detection mechanism is used
the number of bit errors per twenty four hours of continuous operation on an asynchronous line
signal to noise ratio divided by the ratio of energy per bit to noise per hertz

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Computer Networking
The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver

None of these
can send or receive data one at a time
can receive and send data simultaneously
can do one way data transmission only
cannot talk at once

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