ch2_2013 - Chapter 2 Application Layer A note on the use of...

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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: v 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!) v 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: v conceptual, implementation aspects of network application protocols § transport-layer service models § client-server paradigm § peer-to-peer paradigm v learn about protocols by examining popular application-level protocols § HTTP § FTP § SMTP / POP3 / IMAP § DNS v programming network applications § socket API Application 2-3
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Some network apps v e-mail v web v instant messaging v remote login v P2P file sharing v multi-user network games v streaming stored video (YouTube) v voice over IP v real-time video conferencing v cloud computing v v v 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 v client-server v peer-to-peer (P2P) v 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: § communicate with server § may be intermittently connected § may have dynamic IP addresses § do not communicate directly with each other client/server Application 2-8
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