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The message $11011011$ should be transmitted using CRC polynomial $x3+x+1$, to protect it from errors  that message will be transmitted as ________
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1011 )11011011  then we get remainder as 010

hence sequence which will be transmitted is 11011011010
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For the given CRC polynomial the CRC generator will be of 4 bits as 1011.

Now, we have to put (4-1)=3 bits of 0's in message. hence message will become now, 11011011000.

Then we will keep on taking EX-OR between the above message and CRC generator until we get less number of bits than in CRC generator(4) by taking leading 1. then last 3 bits will be actual CRC.

Finally we have to replace that dummy zeroes with this 3 bit CRC.

this whole thing is for sender side.
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