Checksum field in TCP header isa)ones complement of sum of header and data in bytesb)ones complement of sum of header, data and pseudo header in 16 bit wordsc)dropped from IPv6 header formatd)better than md5 or sh1 methodsCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

In the TCP header checksum calculation includes the header, data, and pseudo-header.
All these values are added and stored in one’s complement form.

Important Point:
Checksum is present in IPv4 header format

Answer

Explanation:

Checksum field in TCP header:

- The checksum field in the TCP header is the ones complement of the sum of the header, data, and pseudo header in 16-bit words.
- It is used for error-checking purposes to ensure the integrity of the data transmitted over the network.
- The TCP checksum is calculated by taking the 16-bit one's complement of the one's complement sum of all 16-bit words in the header, data, and pseudo header.
- The pseudo header includes information such as source and destination IP addresses, protocol number, and TCP length.
- By including the pseudo header in the checksum calculation, TCP can detect errors not only in the TCP header and data but also in the IP header.
- This helps in ensuring that the data received at the destination is the same as the data sent by the source.

Benefits of using the ones complement checksum:

- Provides a simple and efficient way to check for errors in the transmitted data.
- Helps in detecting errors that may occur during transmission, such as data corruption or packet loss.
- Enhances the reliability of data transfer over the network by ensuring data integrity.
- The ones complement checksum method is widely used in TCP/IP networks for error detection and correction.

In conclusion, the checksum field in the TCP header is the ones complement of the sum of the header, data, and pseudo header in 16-bit words. It plays a crucial role in ensuring the integrity of the data transmitted over the network.

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