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In a simple echo-request message, the value of the sum is 01010000 01011100. Then, value of checksum is ___________

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In a simple echo-request message, the value of the sum is 01010000 01011100. Then, value of checksum is ___________

(a) 10101111 10100011

(b) 01010000 01011100

(c) 10101111 01011100

(d) 01010000 10100011

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Question is from ICMP topic in section TCP/IP Protocol Suite of Computer Network

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Right option is (a) 10101111 10100011

The explanation is: The sender side adds the bits of the fragmented packet to find a sum. Checksum is the compliment of the sum (exchange 0’s and 1’s). The receiver then has to verify the checksum by adding the bits of the received packet to ensure that the packet is error-free.

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