Computing the Internet Checksum (2). Compute the Internet checksum value for these two 16-bit words: 01000001 11000100 and 00100000 00101011[Note: you can find more problems like this one hereLinks to an external site..]Group of answer choices10011110 0001000110011110 0001000010011110 00001111 01101110 11010101
Question
Computing the Internet Checksum (2). Compute the Internet checksum value for these two 16-bit words: 01000001 11000100 and 00100000 00101011[Note: you can find more problems like this one hereLinks to an external site..]Group of answer choices10011110 0001000110011110 0001000010011110 00001111 01101110 11010101
Solution
To compute the Internet checksum for the two 16-bit words, follow these steps:
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Convert the 16-bit words into hexadecimal for easier calculation.
- 01000001 11000100 converts to 41C4
- 00100000 00101011 converts to 202B
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Add the two hexadecimal numbers together.
- 41C4 + 202B = 643F
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If the sum is larger than 16 bits (i.e., larger than FFFF in hexadecimal), wrap the overflow around by adding 1 to the sum and subtracting 10000 (in hexadecimal). In this case, the sum is not larger than FFFF, so we can skip this step.
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Compute the one's complement of the sum. This is done by flipping all the bits (changing 1s to 0s and 0s to 1s).
- The one's complement of 643F is 9BC0.
So, the Internet checksum value for the two 16-bit words 01000001 11000100 and 00100000 00101011 is 9BC0.
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