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.

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

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Computer Networking
A WATS arrangement

is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is never less expensive than flat-rate service
None of these
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long

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Computer Networking
X.21 is

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

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