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

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

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

signal to noise ratio divided by the ratio of energy per bit to noise per hertz
None of these
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
The probability that one or more errors will be undetected when an error detection scheme is used

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Computer Networking
Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

Cable terminators do not absorb the signal properly
Network collisions occur
Repeaters cannot increase the signal strength sufficiently
Cable terminators do not reflect the signal properly
"Line echo" occurs due to the impedance of the cable

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