Chapter3_3up - Chapter 3 Transport Layer A note on the use...

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1 Transport Layer 3-1 Chapter 3 Transport Layer Computer Networking: A Top Down Approach 5 th edition. Jim Kurose, Keith Ross Addison-Wesley, April 2009. A note on the use of these ppt slides: We’re making these slides freely available to al (faculty, students, readers). They’re in PowerPoint form so you 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 fol owing: ± If you use these slides (e.g., in a class) in substantial y unaltered form, that you mention their source (after al , we’d like people to use our book!) ± If you post any slides in substantial y unaltered form 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 Al material copyright 1996-2010 J.F Kurose and K.W. Ross, Al Rights Reserved Transport Layer 3-2 Chapter 3: Transport Layer Our goals: ± understand principles behind transport layer services: ² multiplexing/demultipl exing ² reliable data transfer ² flow control ² congestion control ± learn about transport layer protocols in the Internet: ² UDP: connectionless transport ² TCP: connection-oriented transport ² TCP congestion control 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 ² segment structure ² reliable data transfer ² flow control ² connection management 3.6 Principles of congestion control 3.7 TCP congestion control
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2 Transport Layer 3-4 Transport services and protocols ± provide logical communication between app processes running on different hosts ± transport protocols run in end systems ² send side: breaks app messages into segments , passes to network layer ² rcv side: reassembles segments into messages, passes to app layer ± more than one transport protocol available to apps ² Internet: TCP and UDP application transport network data link physical application transport network data link physical l o g i c a l e n d - t r s p Transport Layer 3-5 Transport vs. network layer ± network layer: logical communication between hosts ± transport layer: logical communication between processes ² relies on, enhances, network layer services Household analogy: 12 kids sending letters to 12 kids ± processes = kids ± app messages = letters in envelopes ± hosts = houses ± transport protocol = Ann and Bill who demux to in-house siblings ± network-layer protocol = postal service Transport Layer 3-6 Internet transport-layer protocols ± reliable, in-order delivery (TCP) ² congestion control ² flow control ² connection setup ± unreliable, unordered delivery: UDP ² no-frills extension of “best-effort” IP ± services not available: ² delay guarantees ² bandwidth guarantees application transport network data link physical network data link physical network data link physical network data link
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This note was uploaded on 02/14/2012 for the course CSE 3214 taught by Professor Ross during the Winter '12 term at York University.

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Chapter3_3up - Chapter 3 Transport Layer A note on the use...

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