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Lecture 2 application layer

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Chapter 2: Networking Applications areas Application Layer 2-1 Chapter 2: outline 2.1 principles of network applications 2.2 Web and HTTP 2.3 FTP 2.4 electronic mail 2.6 P2P applications ▪ SMTP, POP3, IMAP 2.5 DNS Application Layer 2-2 Chapter 2: application areas 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 Application Layer 2-3 Network apps ❖ Are the driving force behind the Internet ❖ Without useful networking applications, there would be no need for networks ! ❖ Since the Internet’s inception, a huge number of useful applications have been developed Application Layer 2-4 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 Application Layer 2-5 Application architectures possible structure of applications: ❖ client-server ❖ peer-to-peer (P2P) Ap ...
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