高級(jí)計(jì)算機(jī)網(wǎng)絡(luò)chap-展示頁(yè)
2025-03-26 08:37本頁(yè)面
【正文】 ter 1 Uses of Computer Networks ? 計(jì)算機(jī)網(wǎng)絡(luò)的定義： 是用傳輸介質(zhì)把分散在不同地點(diǎn)且具有獨(dú)立功能的多個(gè)計(jì)算機(jī)系統(tǒng)互連 ， 按照網(wǎng)絡(luò)協(xié)議進(jìn)行數(shù)據(jù)通信 ，實(shí)現(xiàn)資源共享的信息系統(tǒng) 。 Uses of Computer Networks ? 計(jì)算機(jī)網(wǎng)絡(luò)與分布式系統(tǒng)的區(qū)別 : ? 分布式系統(tǒng)中 ， 計(jì)算機(jī)的數(shù)量和位置對(duì)用戶透明；而網(wǎng)絡(luò)中 ， 用戶必須指明在某臺(tái)機(jī)器上登錄 ， 遠(yuǎn)程操作時(shí)必須指明把任務(wù)交給哪臺(tái)主機(jī) 。 (middleware) Uses of Computer Networks ? Business Applications ? Home Applications ? Mobile Users ? Social Issues Business Applications of Networks A work with two clients and one server. Business Applications of Networks (2) The clientserver model involves requests and replies. Home Network Applications ? Access to remote information ? Persontoperson munication ? Interactive entertainment ? Electronic merce Home Network Applications (2) In peertopeer system there are no fixed clients and servers. Home Network Applications (3) Some forms of emerce. Mobile Network Users Combinations of wireless works and mobile puting. Social Issues ? New social problem ? Ethical and religion problem ? Political problem Network Hardware ? Local Area Networks ? Metropolitan Area Networks ? Wide Area Networks ? Wireless Networks ? Home Networks ? Interworks Broadcast Networks Types of transmission technology ? Broadcast links ? Pointtopoint links Broadcast Networks (2) Classification of interconnected processors by scale. Local Area Networks Two broadcast works (a) Bus (b) Ring Metropolitan Area Networks A metropolitan area work based on cable TV. Wide Area Networks Relation between hosts on LANs and the sub. ? Hosts ? A munication sub ? Transmission lines ? Switching elements:Routers ? Packets ? Storeandforward(packetswitched) Wide Area Networks (2) A stream of packets from sender to receiver. Wireless Networks Categories of wireless works: ? System interconnection Bluetooth ? Wireless LANs IEEE ? Wireless WANs IEEE Wireless Networks (2) (a) Bluetooth configuration (b) Wireless LAN Wireless Networks (3) (a) Individual mobile puters (b) A flying LAN Home Network Home Network Categories ? Entertainment (TV, DVD, VCR, camera, stereo, MP3) ? Tele (telephone, cell phone, inter, fax) ? Appliances (microwave, fridge(refrigerator), clock, furnace, airco) ? Telemetry (utility meter, smoke/burglar alarm, thermostat, babycam). Interworks ? Gateways ? interworks: inter ? Highspeed lines Network Software ? Protocol Hierarchies ? Design Issues for the Layers ? ConnectionOriented and Connectionless Services ? Service Primitives ? The Relationship of Services to Protocols Network Software Protocol Hierarchies Layers, protocols, and interfaces. ? Network architecture: a set of layers,protocols and interfaces ? Protocol stack ? Header Protocol Hierarchies (2) The philosophertranslatorsecretary architecture. Protocol Hierarchies (3) Example information flow supporting virtua
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