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DRDO CSE 2022 Paper 2 | Question: 18

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To calculate the Internet checksum for the two 16-bit messages, you can follow these steps:

  1. Convert the two messages to binary and concatenate them: 0001 1000 0001 0010 1011 1000 1011 0011

  2. Split the concatenated message into 16-bit words: 0001 1000 0001 0010 1011 1000 1011 0011

  3. Calculate the sum of the 16-bit words: 0001 1000 0001 0010

  • 1011 1000 1011 0011

    1111 0000 1111 0001
  1. If the sum is greater than 16 bits, add the carry to the least significant bits: 1111 0000 1111 0001

  • 0000 0000 0001 0000

    1111 0001 0000 0001
  1. Take the one's complement of the sum to get the checksum: 0000 1110 1111 1110

The Internet checksum for the two 16-bit messages is therefore 0000 1110 1111 1110 (in binary).

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