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ISRO | ISRO CS 2015 | Question 51

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  • Last Updated : 06 Apr, 2018
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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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