CS536-2009-01-22 - CS536: Application Layer Charles Killian...

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CS536: Application Layer Charles Killian Slides used from Kurose-Ross, Computer Networking, a Top Down Approach 2: Application Layer 1
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Announcements PSOs Next Week TAs will be presenting first programming assignment Also on socket programming Programming assignment 1 available on webpage Due Saturday, February 28 th , 2009, 11:59pm • Local time! 2: Application Layer 2
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Recap: Layering Application Transport Network Link Physical 2: Application Layer 3
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2: Application Layer 4 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
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2: Application Layer 5 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
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2: Application Layer 6 Some network apps e-mail web instant messaging remote login P2P file sharing multi-user network games streaming stored video clips voice over IP real-time video conferencing grid computing
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2: Application Layer 7 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
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2: Application Layer 8 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 2.9 Building a Web server
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2: Application Layer 9 Application architectures Client-server Peer-to-peer (P2P) Hybrid of client-server and P2P
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2: Application Layer 10 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
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2: Application Layer 11 Pure P2P architecture no always-on server arbitrary end systems directly communicate peers are intermittently connected and change IP addresses Highly scalable but difficult to manage peer-peer
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2: Application Layer 12 Hybrid of client-server and P2P Skype voice-over-IP P2P application
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This note was uploaded on 10/24/2009 for the course CS 536 taught by Professor Sonia,f during the Spring '08 term at Purdue University-West Lafayette.

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CS536-2009-01-22 - CS536: Application Layer Charles Killian...

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