网络课件networksch01c.pptVIP

Use of networks and Network Hardware Part Ⅲ Uses of Computer Networks Business Applications Home Applications Mobile Users Social Issues Business Applications of Networks A network with two clients and one server. Business Applications of Networks (2) The client-server model involves requests and replies. Home Network Applications Access to remote information Person-to-person communication Interactive entertainment Electronic commerce Home Network Applications (2) In peer-to-peer system there are no fixed clients and servers. Home Network Applications (3) Some forms of e-commerce. Mobile Network Users Combinations of wireless networks and mobile computing. Network Hardware Local Area Networks Metropolitan Area Networks Wide Area Networks Wireless Networks Home Networks Internetworks Broadcast Networks Types of transmission technology Broadcast links Point-to-point links Broadcast Networks (2) Classification of interconnected processors by scale. Local Area Networks Two broadcast networks (a) Bus (b) Ring Metropolitan Area Networks A metropolitan area network based on cable TV. Wide Area Networks Relation between hosts on LANs and the subnet. Wide Area Networks (2) A stream of packets from sender to receiver. Wireless Networks Categories of wireless networks: System interconnection Wireless LANs Wireless WANs Wireless Networks (2) (a) Bluetooth configuration (b) Wireless LAN Wireless Networks (3) (a) Individual mobile computers (b) A flying LAN Home Network Categories Computers (desktop PC, PDA, shared peripherals Entertainment (TV, DVD, VCR, camera, stereo, MP3) Telecomm (telephone, cell phone, intercom, fax) Appliances (microwave, fridge, clock, furnace, airco) Telemetry (utility meter, burglar alarm, babycam). * *