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lecture_7_transport

lecture_7_transport - andComputerNetworks...

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CS 536 Data Communica0ons and Computer Networks Lecture 7: Transport 9/23/2008 CS 536 Computer Networks 1
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CS 536 Computer Networks 3‐2 Transport Layer Our goals: understand principles behind transport layer services: mul0plexing/ demul0plexing reliable data transfer flow control conges0on control learn about transport layer protocols in the Internet: UDP: connec0onless transport TCP: connec0on‐oriented transport TCP conges0on control
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CS 536 Computer Networks 3‐3 Outline 3.1 Transport‐layer services 3.2 Mul0plexing and demul0plexing 3.3 Connec0onless transport: UDP 3.4 Principles of reliable data transfer 3.5 Connec0on‐oriented transport: TCP segment structure reliable data transfer flow control connec0on management 3.6 Principles of conges0on control 3.7 TCP conges0on control
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CS 536 Computer Networks 3‐4 Transport services and protocols provide logical communica+on between app processes running on different hosts transport protocols run in end systems send side: breaks app messages into segments , passes to network layer rcv side: reassembles segments into messages, passes to app layer more than one transport protocol available to apps Internet: TCP and UDP applica0on transport network data link physical applica0on transport network data link physical
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CS 536 Computer Networks 3‐5 Transport vs. network layer network layer: logical communica0on between hosts transport layer: logical communica0on between processes relies on, enhances, network layer services
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CS 536 Computer Networks 3‐6 Internet transport‐layer protocols reliable, in‐order delivery (TCP) conges0on control flow control connec0on setup unreliable, unordered delivery: UDP no‐frills extension of “best‐ effort” IP services not available: delay guarantees bandwidth guarantees applica0on transport network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical applica0on transport network data link physical
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CS 536 Computer Networks 3‐7 Outline 3.1 Transport‐layer services 3.2 Mul0plexing and demul0plexing 3.3 Connec0onless transport: UDP 3.4 Principles of reliable data transfer 3.5 Connec0on‐oriented transport: TCP segment structure reliable data transfer flow control connec0on management 3.6 Principles of conges0on control 3.7 TCP conges0on control
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CS 536 Computer Networks 3‐8 Mul0plexing/demul0plexing applica0on transport network link physical applica0on transport network link physical applica0on transport network link physical P2 P3 P4 P1 host 1 host 2 host 3 = process = socket delivering received segments to correct socket Demul0plexing at rcv host: gathering data from mul0ple sockets, enveloping data with header (later used for demul0plexing) Mul0plexing at send host:
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CS 536 Computer Networks 3‐9
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