TCP/UDP
Question 1 |
Checksum field in the TCP header is
Ones complement of sum of header and data in bytes | |
Ones complement of sum of header, data and pseudo header in 16 bit words | |
Dropped from IPv6 header format | |
Better than md5 or sh1 methods |
Question 1 Explanation:
one’s complement sum of all 16 bit words in the header.
The checksum is not only calculated using TCP/UDP headers and data. It also adds several bits of data from IP header as well. This data is sometimes called as a pseudo header.
The checksum is not only calculated using TCP/UDP headers and data. It also adds several bits of data from IP header as well. This data is sometimes called as a pseudo header.

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