DATA LINK LAYER WIRED NETWORKS
DATA LINK CONTROL DLC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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requiring partial re-transmission of the signal
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requiring re-transmission of the entire signal
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requiring no part of the signal to be re-transmitted
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using parity to correct the errors in all cases
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Detailed explanation-1: -Forward error correction works by adding redundant bits to a bitstream to help the decoder detect and correct some transmission errors without the need for retransmission. The name forward stems from the fact that the flow of data is always in the forward direction (i.e., from encoder to decoder).
Detailed explanation-2: -Hamming Code. Hamming code is useful for both detection and correction of error present in the received data. This code uses multiple parity bits and we have to place these parity bits in the positions of powers of 2.
Detailed explanation-3: -An error correcting code (ECC) is an encoding scheme that transmits messages as binary numbers, in such a way that the message can be recovered even if some bits are erroneously flipped. They are used in practically all cases of message transmission, especially in data storage where ECCs defend against data corruption.
Detailed explanation-4: -An error-correcting code is an algorithm for expressing a sequence of numbers such that any errors which are introduced can be detected and corrected (within certain limitations) based on the remaining numbers. The study of error-correcting codes and the associated mathematics is known as coding theory.