信息網(wǎng)絡(luò)通信基礎(chǔ)(存儲(chǔ)版)
【正文】 data munication 1. Message 報(bào)文 2. Sender 發(fā)送方 3. Receiver 接受方 4. Medium 介質(zhì) 5. Protocol 協(xié)議 8 Data Communications Networking Data Representation 數(shù)據(jù)表示 ? Text 文本 ? Numbers 數(shù)字 ? Images 圖像 ? Audio 音頻 ? Video 視頻 9 Data Communications Networking Figure Data flow (simplex, halfduplex, and fullduplex)p6 數(shù)據(jù)流分為單工、半雙工和雙工 10 Data Communications Networking 12 NETWORKS 網(wǎng)絡(luò) A work is a set of devices (often referred to as nodes) connected by munication links. A node can be a puter, printer, or any other device capable of sending and/or receiving data generated by other nodes on the （ 常常被稱(chēng)為網(wǎng)絡(luò)節(jié)點(diǎn) ） Distributed Processing 分布式處理 Network Criteria 網(wǎng)絡(luò)準(zhǔn)則 Physical Structures物理結(jié)構(gòu) Network Models網(wǎng)絡(luò)模型 Categories of Networks網(wǎng)絡(luò)分類(lèi) Interconnection of Networks: Interwork網(wǎng)絡(luò)互聯(lián)：因特網(wǎng) Topics discussed in this section: 11 Data Communications Networking Distributed processing 分布式處理 Advantages: 1. Security/encapsulation 安全性 /封裝性 2. Distributed databases 分布式數(shù)據(jù)庫(kù) 3. Faster problem solving 更快的解決問(wèn)題方式 4. Security through redundancy 通過(guò)冗余達(dá)到安全性 5. Collaborative processing 協(xié)作處理 12 Data Communications Networking 安全性 網(wǎng)絡(luò)準(zhǔn)則 可靠性 性能 性能：多種形式衡量，包括傳輸時(shí)間和響應(yīng)時(shí)間。 ATM 24 Data Communications Networking A heterogeneous work made of four WANs and two LANs Interwork heterogeneous 不同種類(lèi)的 25 Data Communications Networking 13 THE INTERNET因特網(wǎng) The Inter has revolutionized徹底改變 many aspects of our daily lives. It has affected the way we do business as well as the way we spend our leisure time. The Inter is a munication system that has brought a wealth of information to our fingertips and anized it for our use. A Brief His
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