In CRC if the data unit is 100111001 and the divisor is 1011 then what is dividend at the receiver?
(A) 100111001101
(B) 100111001011
(C) 100111001
(D) 100111001110
Answer: (B)
Explanation:
Step-1: Append (number of bits in divisor - 1) number of zeroes at the end of data unit Data unit = 100111001, append 3 zeroes at the end. = 100111001000 Step 2 Divide using xor subtraction: ______________ 1011) 100111001000 ( 101000001 1011 ------ 01011 1011 ------- 01000 1011 -------- 011 -------- Step 3 Perform Xor-sum of the remainder with the appended zeroes in data unit. = 100111001(000) xor (011) = 100111001011
So, option (B) is correct.
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