09. Transport

09. Transport - Transport Layer Protocols 1 Why do we need...

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1 Transport Layer Protocols
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 2 Why do we need Transport Layer? ± IP layer: global addressing, hop-by-hop forwarding ± Transport layer: end-to-end (reliable) communication ² Distinguish packets to different applications based on the same IP address (TCP & UDP) ² End-to-end flow control and error control (TCP)
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 3 Interface to Applications ± Multiple applications share an IP address through different ports
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User Datagram Protocol (UDP) ± Identify src/dst ports ± Length of the entire segment ± Checksum (optional, 0 means no checksum) ± Unreliable, not ordered, lightweight Communication Networks © Kang Xi, Polytechnic Institute of NYU 4
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Transmission Control Protocol (TCP) ± Identify src/dst ports ± Ordered packet sequence ± Retransmit upon losses ± Decrease transmission rate upon congestions Communication Networks © Kang Xi, Polytechnic Institute of NYU 5
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TCP Header ± Data Offset: The start of the TCP data (in 32-bit) ± Window: size of transmission window ± Urgent Pointer: data [sequence #, sequence # + urgent pointer] are urgent. The standard does not define how to process urgent data. Communication Networks © Kang Xi, Polytechnic Institute of NYU 6
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 Framework of TCP ± Connection ² 3-way handshake ² Duplex ± Data Transfer ± Termination SYN SYN+ACK ACK FIN DATA ACK A B ACK FIN ACK
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This note was uploaded on 11/02/2010 for the course EE 136 taught by Professor Kang xi during the Spring '10 term at NYU Poly.

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09. Transport - Transport Layer Protocols 1 Why do we need...

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