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Lecture12 - TCP & UDP Operations

Lecture12 - TCP & UDP Operations - TCP UDP...

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11/30/2009 1 CNIT 24000 CNIT 24000 – Data Communications & Networks TCP & UDP Operations TCP Provides a reliable host-to-host connection Includes controls for initiation, basic prioritization, flow control, congestion avoidance, and termination of connection Many revisions to TCP exist, including: Slow Start Reno Tahoe Vegas Compound TCP BIC/CUBIC
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11/30/2009 2 TCP Header Format TCP Header Fields Sequence Number – The identifier of this segment being transmitted Acknowledgement Number – The value of the next sequence number expected to be received Data Offset – The number of 32-bit words in the TCP header This indicates where the data begins
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11/30/2009 3 TCP Header Fields cont. Control Fields (1 bit each) URG - Urgent pointer valid flag. ACK - Acknowledgment number valid flag. PSH - Push flag. RST - Reset connection flag. SYN - Synchronize sequence numbers flag.
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