Computer Networking
Which of the following conditions is used to transmit two packets over a medium at the same time?

Asynchronous
Collision
Contention
Synchronous
None of these

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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.

Neither Token-Ring nor Ethernet is the proper choice. Only ARCnet can be used in all topologies
Token-Ring, because it uses a MAU
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 can be set up with most topologies and can use multiple transfer speeds
Ethernet, because it is cabled using fiber-optic cable

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Computer Networking
RS-449/442-A/423-A is

a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
the ratio of the number of data units in error to the total number of data units
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and

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