Calculate an 8 bit UDP checksum for the following three 8 bit words: 0101 0101,
0111 0000, 1100 1100.
In the checksum calculation the sum is calculated using one's complement sum:
bits are added normally , carry bits including except the last carry bit (s) that
are added to the calculated sum.
1011
1101
====
1000
1 (This is the last carry bit!)
=====
1001 (That is the final sum.)
0110 (Here is the one's complement of the sum
= the checksum to be added.)