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

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

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Computer Networking
Which statement describes a spanning-tree network that has converged?

All switch and bridge ports are in the forwarding state.
All switch and bridge ports are either blocking or looping.
All switch and bridge ports are in either the forwarding or blocking state.
All switch and bridge ports are assigned as either root or designated ports.

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