Question

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

Answer 1

Checksum (msg + checksum) = 0000

Step-by-step 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