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
       Computer-Networks       TCP/UDP       ISRO CS 2020       Video-Explanation
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.
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