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TCP/IP hdr checksum : what method is used ?
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Answer / sindhu
Header Checksum: A checksum computed over the header to
provide basic protection against corruption in transmission.
This is not the more complex CRC code typically used by data
link layer technologies such as Ethernet; it's just a 16-bit
checksum. It is calculated by dividing the header bytes into
words (a word is two bytes) and then adding them together.
The data is not checksummed, only the header. At each hop
the device receiving the datagram does the same checksum
calculation and on a mismatch, discards the datagram as damaged.
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Answer / xxx
CRC(cyclic redundancy check)code is a method to find
out the mismatch in the datagram.CRC is a 16-bit check sum
used to calculate by dividing header bytes into words and
then adding together.the same operation will be done by the
receiving device.if there is any mismatch,then it will
discard.
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