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TCP/UDP

TCP/UDP. 指導教授：吳坤熹 演講者：黃驛翔 Class ： IP Telephony. Outline. Introduction Linking to Application Layer Packetization and Reassembly Protocol Data Units TCP Header UDP Header Establishing connection (virtual) TCP technique UDP technique. Outline (Con.). Service Primitives TCP vs. UDP

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TCP/UDP

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  1. TCP/UDP 指導教授：吳坤熹 演講者：黃驛翔 Class：IP Telephony

  2. Outline • Introduction • Linking to Application Layer • Packetization and Reassembly • Protocol Data Units • TCP Header • UDPHeader • Establishing connection (virtual) • TCP technique • UDP technique

  3. Outline (Con.) • Service Primitives • TCP vs. UDP • References

  4. Introduction • Transport layer • Responsible for end-to-end delivery of messages • Responsible for segmentation and reassembly • Two Protocols： • TCP (Transmission Control Protocol) • UDP (User Datagram Protocol)

  5. Introduction • Transport Layer Functions • Linking to Application Layer • Packetization and Reassembly • Establishing connection (virtual) • Connect oriented • Connectionless • Quality of Service (QoS)

  6. Linking to Application Layer • TCP may serve several Application at the same time • User identified by port number or service access point (SAP)

  7. Packetization and Reassembly

  8. Protocol Data Units (PDU) • At each layer, protocols are used to communicate • Control information is added to user data at each layer (PDU = Control + Data) • Transport layer may fragment user data • Transport layer may fragment user data • Each fragment has a transport header added • Destination SAP (port) • Sequence number • Error detection code

  9. TCP Header

  10. UDPHeader

  11. Establishing connection ─ TCP • Connection-oriented • Establishment • Maintenance • Termination • Reliability • Data confirm • Error correction • Flow control

  12. Connection-oriented-Establishment • 3-Way Handshaking

  13. Connection-oriented–Termination uSeq:X, ACK: Y. ACK..FIN • Seq:Y, ACK: X+1, ACK • Seq:Y, ACK: X+1, ACK..FIN xSeq:X+1, ACK: Y+1, ACK

  14. Reliable – Data confirm

  15. Reliable – Error correction

  16. Reliable – Error correction

  17. Flow control • Sliding Window

  18. The usage of TCP

  19. Establishing connection ─ UDP • Connection-less • No acks (Unconfirmed Service) • high rate of transmission • But unreliable • No flow control

  20. Connection-less • Sending packets individually without a virtual circuit • Each packet is sent independently • It will be routed separately, following different routes and arriving at different time

  21. The consideration of using UDP • Reduce the requirement of computer resources • The checking scheme has provided completely by the application program • When using the Multicast or Broadcast to transfer • The transmission of Real-time packets

  22. The usage of UDP • Trivial File Transfer Protocol，TFTP • Simple Network Management Protocol，SNMP • Dynamic Host Configuration Protocol，DHCP • Domain Name System，DNS • Routing Information Protocol，RIP • Real-Time Transport Protocol，RTP

  23. Service Primitives • Primitives specify function to be performed for the transport layer • Four Primitive types • Confirmed service：TCP • Nonconfirmed service：UDP

  24. Primitive Types

  25. Timing Sequence for Service Primitives

  26. TCP vs. UDP TCP UDP connection-oriented connectionless confirmed service unconfirmed service (request, indication, (request, indication) response, confirm) high overhead low overhead (header 20 octets) (header 8 octets) flow control no flow control

  27. References • J. FitzGerald and A. Dennis, “Business Data Communications and Networking”, (9th Ed. 2007), John Wiley & Sons Inc., U.S.A. • J. F. Hurose and K. W. Ross, “computer Networking”, (4th Ed. 2006), Peason Addison-Wesley Inc., U.S.A. • 吳坤熹 教授，”The PowerPoint of IP Telephony class”, 2008 • 陳彥錚 副教授，” The PowerPoint of Computer Networking class, Ch2,Ch6”, 2008 • William Stallings, Computer Networking with Internet Protocols and Technology, Prentice Hall, 2008

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