1. Transport Layer/TCP Thanks to Kai Shen ’ s Networking Course at the University of Rochester.

2. TCP Segment Structure

3. 3a 98 05 cb fd d3 08 27 27 ed de 7d 50 18 fc 00 be 68 00 00 68 00 65 00 6c 00 6f 00 20 00 77 00 6f 00 72 00 6c 00 64 00 21 00 Bytes in TCP Segment: source port: destination port: sequence number: acknowledgment number: urgent:push: reset: synch: finish: checksum: urgent data pointer: application data:

4. 3a 98 05 cb fd d3 08 27 27 ed de 7d 50 18 fc 00 be 68 00 00 68 00 65 00 6c 00 6f 00 20 00 77 00 6f 00 72 00 6c 00 64 00 21 00 Source Port (0x3a98): 15000 Destination Port (0x05cb): 1483 Sequence Number (0xfdd30827): 4258465831 Acknowledgment Number (0x27edde7d): 669900413 Header Length (upper 4 bits is # words 0x5): 5 words or 20 bytes Flags (0x18): 0001 1000 Receive Window (0xfc00): 64512 Checksum (0xbe68): Correct Urgent Data Pointer (0x0000): Not Used Data (68 00 65 00 6c 00 6c 00 6f 00 20 00 77 00 6f 00 6c 00 64 00 21 00): hello world! Bytes in TCP Segment:

8. PureAverageRTT

9. TCP State Transition Diagram Server Client