Compute the Internet checksum for the data block E3 4F 23 96 44 27 99 F3. Then perform the verification calculation

Checksum (msg + checksum) = 0000

Explanation:

Given: E3 4F 23 96 44 27 99 F3

To calculate the check sum, we must divide the block into 4 blocks

0X  E34E

0X  2396

0X  4427

0X  99F3

Addition of hexadecimal blocks.

E34F      1110    0011   0100   1111

2396     0010   0011   1001   0110

              111        11       111       1    

             10000   0110   11011   100101

4427     0100   0100   0010   0111

                           11        11        11  

             10100   1011   0000   1100

99F3     1001    1001    1111    0011

               11       11                          

             1 1110   0100   1111    1111

                 E        4        F        F   (ADDITION OF CHECKSUM)

Complement of checksum    I A 0 0

We avoid exhabit 'I'

At receiver msg + checksum

⇒ E 4 F F

    I A 0 0

    F F F F

Complement is 0000 , i.e noise or error is "0" at receiver

= 0000

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