Transport

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

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Transport Layer Protocols
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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 Distinguish packets to different applications End-to-end flow control and error control (TCP)
Background image of page 2
Communication Networks © Kang Xi, Polytechnic Institute of NYU 3 Interface to Applications Multiple applications share an IP address through different ports IP TCP HTTP FTP Telnet 80 21 23
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 6
Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 Framework of TCP Connection 3-way handshake Duplex Data Transfer Termination SYN SYN+ACK ACK FIN DATA ACK A B ACK FIN ACK
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 24

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

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online