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Transmitting redundant information with each character or
frame to facilitate detection and correction of errors is
called:
A. feedback error control.
B. block sum check.
C. forward error control.
D. cyclic redundancy check.
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Answer: C
Forward error control involves transmitting additional
redundant information with each character or frame to
facilitate detection and correction of errors. In feedback
error control, only enough additional information is
transmitted so the receiver can identify that an error has
occurred. Choices B and D are both error detection methods
but not error correction methods. Block sum check is an
extension of parity check wherein an additional set of
parity bits is computed for a block of characters. A cyclic
redundancy check is a technique wherein a single set of
check digits is generated for each frame transmitted, based
on the contents of the frame.
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