Modification attacks directly impact the integrity of data within the IT Security Model. Integrity ensures that information is accurate and unchanged from its original form unless altered by authorized means. An attack that involves modification manipulates data in unauthorized ways, thereby compromising its accuracy and reliability. References:

Shon Harris, "CISSP Certification: All-in-One Exam Guide".

In the Transmission Control Protocol (TCP) header, the sequence number field is crucial for ensuring the correct sequencing of the packets sent over a network.

The sequence number field in the TCP header is 32 bits long, which equates to 4 bytes.

This sequence number is used to keep track of the bytes in a sequence that are transferred over a TCP connection, ensuring that packets are arranged in the correct order and data integrity is maintained during transmission.

References

Postel, J., "Transmission Control Protocol," RFC 793, September 1981.

"TCP/IP Guide," Kozierok, C. M., 2005.