In CRC if the data unit is 100111001 and the divisor is 1011 then what is…

To find the dividend at the receiver, we first calculate the CRC remainder. The data unit is 100111001 and the divisor is 1011. Since the divisor has 4 bits, we append 3 zeros to the data unit: 100111001000.

Performing modulo-2 division of this augmented data by the divisor yields a remainder of 101. The dividend at the receiver is formed by appending this remainder to the original data unit: 100111001 + 011 = 100111001011.