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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Two-dimensional parity-check can detect up to ____ bit errors.
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1
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2
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3
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4
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Explanation:
Detailed explanation-1: -Two positions cannot simultaneously be in the same row and same column; hence the error can be detected. Yes, two-dimensional parity catches all 3-bit errors.
Detailed explanation-2: -Say the error is on bit 3, so the symbol received is 0100 1001; this error is easily detected because the number of 1s is 3 (odd) instead of an even number. A single parity bit can only detect an error, it cannot be used to correct errors; we need more redundant bits if we want to also correct errors.
Detailed explanation-3: -Two-Dimension Parity Checking increases the likelihood of detecting burst errors. As we have shown in Fig. 3.2. 4 that a 2-D Parity check of n bits can detect a burst error of n bits.
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