Given the segment header below of a transport protocol along with the following checksum definition that is computed and then stored before every segment is sent to a receiver: Treat the Source_port, Destination_port and Length fields as 8 bit numbersAdd the Source port to the Destination port to obtain Result_1Add Result_1 to the Length field to obtain Result_2Take the 1’s complement of Result_2 and put the 8 bit value in the Checksum field <----1 byte----> <----1 byte---->Source_port Destination_portLength Checksum Compute the value that will be put in the Checksum file for the segment below. Show your work and the final Checksum value. 0011 01000110 10000001 0010
Question
Given the segment header below of a transport protocol along with the following checksum definition that is computed and then stored before every segment is sent to a receiver: Treat the Source_port, Destination_port and Length fields as 8 bit numbersAdd the Source port to the Destination port to obtain Result_1Add Result_1 to the Length field to obtain Result_2Take the 1’s complement of Result_2 and put the 8 bit value in the Checksum field <----1 byte----> <----1 byte---->Source_port Destination_portLength Checksum Compute the value that will be put in the Checksum file for the segment below. Show your work and the final Checksum value. 0011 01000110 10000001 0010
Solution
The given segment is:
Source_port: 0011 0100 (52 in decimal) Destination_port: 0110 1000 (104 in decimal) Length: 0001 0010 (18 in decimal)
Step 1: Add the Source port to the Destination port to obtain Result_1 Result_1 = Source_port + Destination_port = 52 + 104 = 156
Step 2: Add Result_1 to the Length field to obtain Result_2 Result_2 = Result_1 + Length = 156 + 18 = 174
Step 3: Take the 1’s complement of Result_2 and put the 8 bit value in the Checksum field The binary representation of 174 is 10101110. The 1's complement of this binary number is obtained by flipping all the bits, i.e., changing all 1's to 0's and all 0's to 1's. So, the 1's complement of 10101110 is 01010001.
So, the value that will be put in the Checksum field is 01010001.
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