Computer Networking Chapter 3 A Top-Down Approach Transport Layer KUROSE ROSS A note on the use of these ppt slides: Computer We're making these slides freely available to all (faculty,students,readers). They're in PowerPoint form so you see the animations;and can add,modify. Networking:A and delete slides (including this one)and slide content to suit your needs. They obviously represent a lot of work on our part.In return for use,we only Top Down ask the following: If you use these slides (e.g.,in a class)that you mention their source Approach (after all,we'd like people to use our book!) 6th edition If you post any slides on a www site,that you note that they are adapted from (or perhaps identical to)our slides,and note our copyright of this Jim Kurose,Keith Ross material. Addison-Wesley Thanks and enjoy!JFK/KWR March 2012 urRhts Reserved Transport Layer 3-1
Transport Layer 3-1 Chapter 3 Transport Layer Computer Networking: A Top Down Approach 6th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 A note on the use of these ppt slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: If you use these slides (e.g., in a class) that you mention their source (after all, we’d like people to use our book!) If you post any slides on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2013 J.F Kurose and K.W. Ross, All Rights Reserved
Chapter 3:Transport Layer our goals: understand learn about Internet principles behind transport layer transport layer protocols: services: ■UDP:connectionless ■multiplexing, transport demultiplexing -TCP:connection- ■reliable data oriented reliable transfer transport ■flow control TCP congestion control congestion control Transport Layer 3-2
Transport Layer 3-2 Chapter 3: Transport Layer our goals: understand principles behind transport layer services: multiplexing, demultiplexing reliable data transfer flow control congestion control learn about Internet transport layer protocols: UDP: connectionless transport TCP: connectionoriented reliable transport TCP congestion control
Chapter 3 outline 3.1 transport-layer 3.5 connection-oriented services transport:TCP 3.2 multiplexing and segment structure demultiplexing -reliable data transfer 3.3 connectionless ■flow control transport:UDP connection 3.4 principles of management reliable data 3.6 principles of transfer congestion control 3.7 TCP congestion control Transport Layer 3-3
Transport Layer 3-3 Chapter 3 outline 3.1 transport-layer services 3.2 multiplexing and demultiplexing 3.3 connectionless transport: UDP 3.4 principles of reliable data transfer 3.5 connection-oriented transport: TCP segment structure reliable data transfer flow control connection management 3.6 principles of congestion control 3.7 TCP congestion control
Transport services and protocols application provide logical transport network data link o communication between physical app processes running on different hosts transport protocols run in end systems send side:breaks app logical end-end transport messages into segments,passes to network layer app cation transport network -rcv side:reassembles data lin segments into messages,passes to app layer more than one transport protocol available to apps Transport Layer 3-4
Transport Layer 3-4 Transport services and protocols provide logical communication 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 application transport network data link physical logical end-end transport application transport network data link physical
Transport vs.network layer *network layer: logical household analogy片 communication 12 kids in Ann's house between hosts sending letters to 12 kids in Bill's house: transport layer: hosts houses logical processes kids communication app messages letters between in envelopes processes transport protocol Ann and Bill who demux to in- ■relies on, house siblings enhances, network-layer protocol network layer postal service services Transport Layer 3-5
Transport Layer 3-5 Transport vs. network layer network layer: logical communication between hosts transport layer: logical communication between processes relies on, enhances, network layer services 12 kids in Ann’s house sending letters to 12 kids in Bill’s house: hosts = houses processes = kids app messages = letters in envelopes transport protocol = Ann and Bill who demux to inhouse siblings network-layer protocol = postal service household analogy: