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Why should file transport protocols compute a checksum on the file data they receive even when...

Why should file transport protocols compute a checksum on the file data they receive even when using a reliable end-to-end stream transfer protocol like TCP.

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Answer #1

The TCP can send the data reliably over the network because of 2 main reasons.

  1. It can check if the data has been transmitted or not and received at the other end by ACK and NACK signals.
  2. It can resend the packets that have not been sent or if the packets are dropped.

But whenever we send data from one place to another there is always a possibility that the data can get corrupted, altered or have some errors in it due to some noise or other reasons. To check if the data that the receiver has received is correct or not, we use checksum.

So, the TCP guarantees the reliable transfer of the packets, but it is not necessary that all the packets are error free. So, for that reason we use checksum.

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