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
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
None of these
the number of bit errors per twenty four hours of continuous operation on an asynchronous line

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Computer Networking
MAC is

a method of determining which device has access to the transmission medium at any time
None of these
network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
a very common bit-oriented data link protocol issued to ISO.

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Computer Networking
Ethernet and Token-Ring are the two most commonly used network architectures in the world. Jim has heard of the different topologies for networks and wants to choose the architecture that will provide him with the most options. Which of the following would that be? Choose the most correct answer.

Ethernet, because it can be set up with most topologies and can use multiple transfer speeds
Neither Token-Ring nor Ethernet is the proper choice. Only ARCnet can be used in all topologies
Ethernet, because it is cabled using fiber-optic cable
Token-Ring because it currently can run at both 4Mbps and 16Mbps. This means that it can be used in any topology
Token-Ring, because it uses a MAU

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