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TCP has an end-to-end checksum that covers part of IP header and TCP header and data. When the receiver receives packet whose checksum is not matching, then it can do the following things.
1. Discard the segment and send ACK to sender with cumulative ACK set to next in sequence bytes its expect to the  receiver.
2. Discard the segment and do nothing.
Which one of the above actions is preferable?
in Computer Networks by (33 points) | 10 views
2. Discard the segment and do nothing.

Generally,when the receiver receives a segment whose checksum is matching, it sends the next expecting sequence number as the acknowledgment message to the sender. However if the checksum is not matching then receiver simply discards that segment and doesn't send any acknowledgment. Now if the Sender doesn't receive an acknowledgment for a sent segment within a specified time period then it resends that segment with same sequence number.

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