數(shù)據(jù)通信與計(jì)算機(jī)網(wǎng)絡(luò)--網(wǎng)絡(luò)互連與internet技術(shù)2(完整版)
【正文】 之間是可以相互轉(zhuǎn)換的 TCP/IP協(xié)議 IP地址被分為五類 TCP/IP協(xié)議 ? A類地址用于有大量主機(jī)的超大型網(wǎng)絡(luò) ? B類地址用于有很多的大型或中型網(wǎng)絡(luò) ? C類地址用于主機(jī)數(shù)量不多的小型網(wǎng)絡(luò) ? D類地址用于多目的地址廣播傳遞 ? E類地址保留，主要用于研究和實(shí)驗(yàn) 5種 IP地址的用途 TCP/IP協(xié)議 查找地址的過程： TCP/IP協(xié)議 TCP/IP協(xié)議 主機(jī)的 IP地址：包括網(wǎng)絡(luò)標(biāo)識(shí)號(hào)和主機(jī)標(biāo)識(shí)號(hào)兩部分 TCP/IP協(xié)議 A類地址空間 Millions of class A addresses are wasted TCP/IP協(xié)議 B類地址空間 Many class B addresses are wasted C類地址空間 The number of addresses in a class C block is smaller than the needs of most anizations. TCP/IP協(xié)議 TCP/IP協(xié)議 Class E addresses are reserved for special purposes?？蓳芴?hào)、專線、無線上網(wǎng) ? 信息資源極為豐富。 ? 1974年 TCP/IP協(xié)議誕生。聯(lián)網(wǎng)設(shè)備增加 N倍，效率增加 N2倍 Inter的發(fā)展的規(guī)律 Inter技術(shù) 網(wǎng)絡(luò)帶寬與 CPU性能 2023 1998 1996 All Other IPX TCP/IP Traffic Ratios Source: Gartner 1997 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Inter技術(shù) Relative User Population 8% 17% 39% 27% 7% 2% 13% 18% 23% 23% 16% 7% 14% 17% 12% 15% 28% 14% To Transactional Pages (Red) and Audio/Video Content (Purple) 100% 80% 60% 40% 20% 0% 2023 1998 1996 Source: The Yankee Group, 1996 Inter技術(shù) Simple Video, Multimedia Browsing, PCM Voice IP, PCS, EMail, File Transfer Paging Video Conferencing, MPEG1 NTSC Video Tel, VoIP ISDN, Frame Relay ATM/POS T3/E3 T1/E1 New Modem Wireless WAN Old Modem .004 .0192 .0288 .128 3 155 Mb/s Minimum Bandwidth for Application per User Virtual Reality, Medical Imaging Inter技術(shù) Inter Data/Voice/Video Transport Convergence Inter技術(shù) ? Inter的應(yīng)用 ? 在信息交流方面的應(yīng)用 ? 在教育方面的應(yīng)用 ? 在醫(yī)療方面的應(yīng)用 ? 在政府工作中的應(yīng)用 ? 在商業(yè)領(lǐng)域的應(yīng)用 ? 在娛樂方面的應(yīng)用 Inter技術(shù) Inter技術(shù) Inter提供的服務(wù)： ? Everything is digital: voice, video, music, pictures ? Everything is online: bank statement, medical record, books, airline schedule, weather, highway traffic, toaster, refrigerator … ? Everyone is connected: doctor, teacher, broker, mother, son, friends, enemies Inter技術(shù) 當(dāng)前的狀況： ? Electronic merce ? virtual enterprise ? Inter entertainment ? interactive sit ? World as a small village ? munity anized according to interests ? enhanced understanding among diverse groups ? Electronic democ
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