Computer Networking
Error control is needed at the transport layer because of potential errors occurring _____.

from packet losses.
in routers
from out-of-sequence delivery
from transmission line noise

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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
a check bit appended to an array of binary digits to make the sum of the all the binary digits
None of these
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-

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