TCP and UDP packet checksum

TCP is connection oriented protocol. Each transmission that is done is verified using checksum that is included within TCP packet. Corruption of data may occur during transmission of such data. If corruption is detected in the TCP transmission, than a request is made to retransmit that packet.

Critical data transfer that requires verification of data is done using TCP protocol.

UDP on other hand is connection less protocol, it prioritizes data flow over data availability, however even UDP packet has checksum of the data. If checksum within the packet and checksum generated by receiving end do no match, then such packet is discarded.

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