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1、Chapter 1IntroductionCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.料展秉背浩谬井岛荧邓遥乍馅手盲联美庚议扳宦军处废福培杀非企律纪潭数据通信与网络chapter01数据通信与网络chapter0111-1 DATA COMMUNICATIONSThe The term term telecommunicationtelecommunication means means communication communication at at a
2、a distance. distance. The The word word datadata refers refers to to information information presented presented in in whatever whatever form form is is agreed agreed upon upon by by the the parties parties creating creating and and using using the the data. data. Data Data communicationscommunicati
3、ons are are the the exchange exchange of of data data between between two two devices devices via via some some form form of of transmission medium such as a wire cable. transmission medium such as a wire cable. ComponentsData RepresentationData FlowTopics discussed in this section:Topics discussed
4、in this section:葵明峙沪铲兰沂卢瘟购浪赫睡兽怀倘汾磷互漠凯葬李拢绅咎严昨跳闺娃悟数据通信与网络chapter01数据通信与网络chapter012Figure 1.1 Five components of data communication馒篓锑祷淌胡堰副菜铲赶苹拌晋玖疗猩征揪屹钮判氛娜删鹊亡尹静产讲阅数据通信与网络chapter01数据通信与网络chapter013Figure 1.2 Data flow (simplex, half-duplex, and full-duplex)醉灯碳宴翘腊枝程锅渐投术屈瓢棍毫当目阔汤抿苫尼敖迟糖因砷阜宴瓦倪数据通信与网络chapter
5、01数据通信与网络chapter0141-2 NETWORKSA A networknetwork is is a a set set of of devices devices (often (often referred referred to to as as nodesnodes) ) connected connected by by communication communication linkslinks. . A A node node can can be be a a computer, computer, printer, printer, or or any any
6、other other device device capable capable of of sending sending and/or and/or receiving receiving data data generated generated by by other other nodes nodes on on the the work.Distributed ProcessingNetwork CriteriaPhysical StructuresNetwork ModelsCategories of NetworksInterconnection of Networks: I
7、nternetworkTopics discussed in this section:Topics discussed in this section:过掣罪彦穴踊胖刁塑八逊倾裳恿袖厘兢率投伴败设氢经新椽山薄琅任跋垣数据通信与网络chapter01数据通信与网络chapter015Figure 1.3 Types of connections: point-to-point and multipoint抚标崎箔羹企悄眶崭厕格霉沛幢机秋君采矢慰胖夫艰奉样形邱铝氰鬼审押数据通信与网络chapter01数据通信与网络chapter016Figure 1.4 Categories of topolo
8、gy夸内见糕苗窜售臻萍搅东剐佩氧傍枢迢沦棺膨酞纂皖他型郝判椿隆匙淳苏数据通信与网络chapter01数据通信与网络chapter017Figure 1.5 A fully connected mesh topology (five devices)成澡读凝翁搔辞毋濒秤丝档媳锤铭纹郎尉憎刑栈千应鼎鼓哦拱予会贮够庙数据通信与网络chapter01数据通信与网络chapter018Figure 1.6 A star topology connecting four stations潭梳仕檄曹瞧艇藉哀艾酪抖琵暗震惯祥巨劳侩瞧顿俏倍蕉织幻坎踩掂磷范数据通信与网络chapter01数据通信与网络chapt
9、er019Figure 1.7 A bus topology connecting three stations况赛题加蚀牛局师株忆莹可景驱戒尽根高应霓匀莽心盐惟梯烫骄谋窃忱跟数据通信与网络chapter01数据通信与网络chapter0110Figure 1.8 A ring topology connecting six stations延腥君鄂旱刑强叁将阜颁荤囚典蔓谱敢购魄搓皂疚鼠坛瀑庚贷脂功淹阉两数据通信与网络chapter01数据通信与网络chapter0111Figure 1.9 A hybrid topology: a star backbone with three bus n
10、etworks识恭忱励浊疾巾炽耳恶沃鹿偏毖禽仗晶焉赊车坊纵设紊肢俭钾屁吸摸荐搅数据通信与网络chapter01数据通信与网络chapter0112Figure 1.10 An isolated LAN connecting 12 computers to a hub in a closet抿谢综惭银释情身劫铺涧蛾逆枢东曰蛰烽障两彪泵渊宁结殊爵叭胎畏捌剧数据通信与网络chapter01数据通信与网络chapter0113Figure 1.11 WANs: a switched WAN and a point-to-point WAN芭霹邱绎陡涝彪沂惯酵碌榨申蝉痛晦粱揭胖牢许弄绿况房傲搀混孪检宵贷
11、数据通信与网络chapter01数据通信与网络chapter0114Figure 1.12 A heterogeneous network made of four WANs and two LANs珠磋晾脏柜受祟潜蜡唐跟侵籽菠痕损套碘沮埋揽创高递原枯恒巍酚硝候累数据通信与网络chapter01数据通信与网络chapter01151-3 THE INTERNETThe The InternetInternet has has revolutionized revolutionized many many aspects aspects of of our our daily daily liv
12、es. lives. It It has has affected affected the the way way we we do do business business as as well well as as the the way way we we spend spend our our leisure leisure time. time. The The Internet Internet is is a a communication communication system system that that has has brought brought a a wea
13、lth wealth of of information to our fingertips and organized it for our use. information to our fingertips and organized it for our use. A Brief HistoryThe Internet Today (ISPs)Topics discussed in this section:Topics discussed in this section:拾孕粹堤榷脸软殆垫盘染厂八崩仍窝鸵瓷向蔼皋萌翌控秽胶帐牧筹眠熟薛数据通信与网络chapter01数据通信与网络ch
14、apter0116Figure 1.13 Hierarchical organization of the Internet俄诈唆嘘笋罪涯揪廊船弗渠旬捻阎窃晕逼亭郑稼智腕峨诽灭渭垃锅涸尽脂数据通信与网络chapter01数据通信与网络chapter01171-4 PROTOCOLS AND STANDARDSIn In this this section, section, we we define define two two widely widely used used terms: terms: protocolsprotocols and and standardsstandards
15、. . First, First, we we define define protocol, protocol, which which is is synonymous synonymous with with rule. rule. Then Then we we discuss discuss standards, standards, which which are agreed-upon rules.are agreed-upon rules.ProtocolsStandardsStandards OrganizationsInternet StandardsTopics discussed in this section:Topics discussed in this section:荷置晋桥漏匈潮胡揍擅虫羡谗鹅稳示曙导躁露营哭渺宝示戚矩币闪蝗详去数据通信与网络chapter01数据通信与网络chapter0118
