网络程序设计导论 - CHATSYS.pdfVIP

网络程序设计导论 主讲：孟宁 电话：0512 E-mail：mengning@ 主页：/~mengning 地址：苏州工业园区独墅湖高等教育区仁爱路 166号明德楼A302室 网络程序设计导论 • 计算机网络的发展 • OSI模型与TCP/IP协议族 • IPv4 and IPv6 • ARP协议 • 网络程序设计中的几种不同视角 • 电信/通信行业软件开发主要涉及的领域 Advanced Research Project Agency Network ARPANET (1970s) National Science Foundation NSFNET (1980s) Growth of NSFNET The Internet: a Network of Networks Internet Properties • All hosts on the Internet communicate using common network protocols – TCP/IP, first developed for ARPANET • Different parts of the Internet are operated by different entities – governments, telephone companies, universities etc. • No single organization controls or owns the Internet OSI Abstraction Layers • 7: Application layer 7: Application layer 77:: AApppplliiccaattiioonn llaayyeerr – E.g., terminal emulation, file transfer E.g., terminal emulation, file transfer EE..gg..,, tteerrmmiinnaall eemmuullaattiioonn,, ffiillee ttrraannssffeerr • 6: Presentation layer 6: Presentation layer 66:: PPrreesseennttaattiioonn llaayyeerr – Handles encryption, compression, other translation of messages Handles encryption, compression, other translation of messages HHaannddlleess eennccrryyppttiioonn,, ccoommpprreessssiioonn,, ootthheerr ttrraannssllaattiioonn ooff mmeessssaaggeess • 5: Session layer 5: Session layer 55:: SSeessssiioonn llaayyeerr – Establishes and terminates connections between applications Establishes and terminates connections between applications EEssttaabblliisshheess aanndd tteerrmmiinnaatteess ccoonnnneeccttiioonnss bbeettwweeeenn aapppplliiccaattiioonnss • 4: Transport layer 4: Transport layer 44:: TTrraannssppoorrtt llaayyeerr – Div