Computer Networking
What does a VLAN do?

Acts as the fastest port to all servers.
Provides multiple collision domains on one switch port.
Breaks up broadcast domains in a layer 2 switch internetwork.
Provides multiple broadcast domains within a single collision domain.

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

the ratio of the number of data units in error to the total number of data units
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
a set of physical layer standards developed by EIA and intended to replace RS-232-
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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