Chapter2 - 1 2: Application Layer 1 Chapter 2 Application...

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Unformatted text preview: 1 2: Application Layer 1 Chapter 2 Application Layer Al material copyright 1996-2007 J.F Kurose and K.W. Ross, Al Rights Reserved 2: Application Layer 2 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 2: Application Layer 3 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 ¡ ¡ ¡ 2: Application Layer 4 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 2: Application Layer 5 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: Application Layer 6 Application architectures ¡ Client-server ¡ Peer-to-peer (P2P) ¡ Hybrid of client-server and P2P 2 2: Application Layer 7 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 2: Application Layer 8 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 2: Application Layer 9 Hybrid of client-server and P2P Skype ¡ voice-over-IP P2P application ¡ centralized server: finding address of remote party: ¡ client-client connection: direct (not through server) Instant messaging ¡ chatting between two users is P2P ¡ centralized service: client presence detection/location • user registers its IP address with central server when it comes online • user contacts central server to find IP addresses of buddies 2: Application Layer 10 Processes communicating Process: program running within a host. ¢ within same host, two processes communicate using inter-process communication (defined by OS)....
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This note was uploaded on 10/27/2009 for the course CSE 830 taught by Professor Ofria during the Fall '08 term at Michigan State University.

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Chapter2 - 1 2: Application Layer 1 Chapter 2 Application...

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