ch2 - Chapter2 ApplicationLayer A note on the use of these...

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Chapter 2 Application 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 all (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 following: If you use these slides (e.g., in a class) in substantially unaltered form, that you mention their source (after all, we’d like people to use our book!) If you post any slides in substantially 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 All material copyright 1996-2010 J.F Kurose and K.W. Ross, All Rights Reserved Application 2-1
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Chapter 2: Application layer 2.1  Principles of network  applications 2.2  Web and HTTP 2.3  FTP  2.4  Electronic Mail SMTP, POP3, IMAP 2.5  DNS 2.6  P2P applications 2.7  Socket programming with TCP 2.8  Socket programming with  UDP Application 2-2
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Chapter 2: Application Layer Our goals:   conceptual, implementation  aspects of network  application protocols transport-layer service  models client-server paradigm peer-to-peer paradigm learn about protocols by  examining popular  application-level protocols HTTP FTP SMTP / POP3 / IMAP DNS programming network  applications socket API Application 2-3
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Some network apps e-mail web instant messaging remote login P2P file sharing multi-user network games streaming stored video  (YouTube) voice over IP real-time video conferencing cloud computing …    Application 2-4
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Creating a network app write programs that run on (different) end systems communicate over network e.g., web server software  communicates with browser  software No need to write software for  network-core devices network-core devices do not run user  applications  applications on end systems  allows  for rapid app development,  propagation application transport network data link physical application transport network data link physical application transport network data link physical Application 2-5
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Chapter 2: Application layer 2.1 Principles of network  applications 2.2  Web and HTTP 2.3  FTP  2.4  Electronic Mail SMTP, POP3, IMAP 2.5  DNS 2.6  P2P applications 2.7  Socket programming with TCP 2.8  Socket programming with UDP Application 2-6
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Application architectures client-server peer-to-peer (P2P) hybrid of client-server and P2P Application 2-7
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Client-server architecture server:   always-on host permanent IP address server farms for scaling clients:
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ch2 - Chapter2 ApplicationLayer A note on the use of these...

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