Question Bank - Computer Networks

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The message 11001001 is to be transmitted using the CRC polynomial x3 + 1 to protect it from errors. The message that should be transmitted is

A.
11001001000
B.
11001001011
C.
11001010
D.
1.10E+11

Solution:

The correct answer is option 2CalculationMessage: 11001001CRC polynomial: x3 +1 = 1.x3 + 0.x2 + 0.x1 + 1.x0CRC generator: 1001Since polynomial is of order 3 append 3 0s at the end of messageMessage: 11001001000 1100 1001 000 ? 1001 _____________ 01011 ? 1001 __________ 001000 ? 1001 ________ 0001100 ? 1001 _________ 01010 ? 1001 ___________ 011 Transmitted Message:11001001011

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