GATE CS 2021 Set 2 — Question 44
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Computer Networks → Data Link Layer → Error Detection (Parity, CRC)
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Question
Consider the cyclic redundancy check (CRC) based error detecting scheme having the generator polynomial . Suppose the message is to be transmitted. Check bits are appended at the end of the message by the transmitter using the above CRC scheme. The transmitted bit string is denoted by . The value of the checkbit sequence is
Correct answer
(C) 100
Solution
1.The generator polynomial corresponds to the bit string (coefficients of ).
2.The message . The number of check bits to be appended is (the degree of the generator polynomial).
3.Append zeros to the message: .
4.Perform modulo-2 division of by :
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