Computer Chapter 3 Networking ATO中DOWN APPROACH 华NTHEDITION Transport Layer KUROSE·ROSS A note on the use of these Powerpoint 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 /ot of work on our part.In return for use,we only ask the following: Computer .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!) Networking:A Top If you post any slides on a ww site,that you note that they are adapted from(or perhaps identical to)our slides,and note our copyright of this Down Approach materal. 7th edition Thanks and enjoy!JFK/KWR Jim Kurose,Keith Ross A material copright1-2016 Pearson/Addison Wesley J.F Kurose and K.W.Ross.All Rights Reserved April 2016 Transport Layer 2-1
Computer Networking: A Top Down Approach A note on the use of these Powerpoint 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 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved 7 th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016 Chapter 3 Transport Layer Transport Layer 2-1
Chapter 3:Transport Layer our goals: understand principles learn about Internet behind transport transport layer protocols: layer services: ·UDP:connectionless ·multiplexing, transport demultiplexing TCP:connection-oriented reliable data transfer reliable transport ·flow control TCP congestion control ·congestion control Transport Layer3-2
Transport Layer3-2 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: connection-oriented reliable transport • TCP congestion control
Chapter 3 outline 3.I transport-layer services 3.5 connection-oriented 3.2 multiplexing and transport:TCP demultiplexing ·segment structure 3.3 connectionless transport: reliable data transfer UDP 。flow control 3.4 principles of reliable data connection management transfer 3.6 principles of congestion control 3.7 TCP congestion control Transport Layer3-3
Transport Layer3-3 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 transport provide logical communication network data link between app processes physical running on different hosts transport protocols run in end systems ·send side:breaks app messages into segments, logical end-end transport passes to network layer rcv side:reassembles segments into messages, network passes to app layer ata link more than one transport protocol available to apps ·Internet:TCP and UDP Transport Layer3-4
Transport Layer3-4 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 • Internet: TCP and UDP application transport network data link physical application transport network data link physical
Transport vs.network layer network layer:logical communication household analogy: between hosts 1 2 kids in Ann's house sending letters to 1 2 kids in Bill's ■transport layer: house: logical hosts houses communication processes kids between processes app messages letters in envelopes ·relies on,enhances,. network layer transport protocol Ann and Bill who demux to in- services house siblings network-layer protocol postal service Transport Layer3-5
Transport Layer3-5 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: