A checksum (also known as a hash sum) is a small size datum computed from a block of digital data. One would use a checksum to detect errors that could have been introduced during storage.
A checksum is used solely to see if a file has changed or to see if two files contain exactly the same data. The chances of two different files having the same checksum is very, very small. If you change a file in any way, even by one byte, the checksum will change.
RIP messages are wrapped in a UDP package, which already has a checksum.
A checksum is used to determine that the information sent using the protocol has not been corrupted en-route.
Only TCP will automatically discard a packet with a bad checksum. UDP packets have a checksum field, but it is rarely used, and then only by the application (not UDP itself)
7b
128
yes
00000000
they all discard it because if checksum error error it mean data is sent byother user and it forget its rout due to fault of channel if reach thereso it is not need to notify the source about this error
A checksum is a part of almost any number you want to include self-verification. Some examples are credit card numbers, bank account numbers, computer file "fingerprints," and computer security codes. See related links for a more detailed explaination of ways checksum is calculated.
they all discard it because if checksum error error it mean data is sent by other user and it forget its rout due to fault of channel if reach there so it is not need to notify the source about this error (Waqas Qadeer)
A UDPheader contains four 16-bit fields. They are the source port, destination port, length, and checksum -- in that order.