next-available number assigned by TCP/IP to the user's machine, the number used by a program on one side of communication to receive data from another program on the other end, a counter used to keep track of every byte sent outward by a host, is sent by the TCP server, indicating that is has received cumulated data and is ready for the next segment, 20-60 bytes, always set to 0, bits that are in the header, set to on with the value of 1 or off with the value 0, serves important purpose for the flow of data, a method used to detect errors in TCP packets, data that should be processed as soon as possible, MSS, Window Scaling, Selective Acknowledgements, Timestamps, Nop.

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