Transportation Protocols: UDP, TCP & RTP

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Lecture 11TCP Connection Control: Startup & Shutdown• TCP is connection-oriented.- A connection must be established, called startup, before data communications- A connection must be terminated, called shutdown, if no data to be sent.• Connect start must be reliable and shutdown must graceful• Difficult because segments can be- lost- duplicated- delayed- delivered out of order- Either side can crash- Either side can reboot• Needed to avoid duplicated “shutdown” message from affecting later connection
TCP Three-Way HandshakeLecture 11- TCP uses three-message exchanges called 3-way handshake to startup/shutdown- Synchronization segment (SYN) to describe messages in startup connection- Finish segment (FIN) to describe message in shutdown connection- Host 1 sends segment with SYN/FIN bit set and a random sequence number- Host 2 responds with segment with SYN/FIN bit set, acknowledgment to Host 1,and the random sequence number- Host 1 responds with acknowledgment- Remember TCP segment will retransmit lost, duplicated, delayed- 3-way handshake ensures unambiguous, reliable, graceful startup/shutdowndespite packet loss, duplication and delayAnimationAnimation
Page 8 and 9: Server, Client and Port ExampleLect
Page 10: Lecture 11TCPApplicationsPort Numbe
Page 14 and 15: Setting Appropriate Value of Timeou
Page 16 and 17: Lecture 11TCP Flow Control• Flow
Page 20 and 21: Lecture 11Comparison between UDP an
Page 22 and 23: RTP Message FormatLecture 110 15 31

Transportation Protocols: UDP, TCP & RTP

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