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
Error detecting code is

a code in which each expression conforms to specify rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
the ratio of the 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 all the binary digits.
an error-detecting code based on a summation operation performed on the bits to be checked

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