数据通信与网络chapter01.ppt
1.1,Chapter 1Introduction,Copyright 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chapter01,1.2,1-1 DATA COMMUNICATIONS,The term telecommunication means communication at a distance.The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data.Data communications are the exchange of data between two devices via some form of transmission medium such as a wire cable.,ComponentsData RepresentationData Flow,Topics discussed 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chapter01,1.3,Figure 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chapter01,1.4,Figure 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chapter01数据通信与网络chapter01,1.5,1-2 NETWORKS,A network is a set of devices(often referred to as nodes)connected by communication links.A node can be a computer,printer,or any other device capable of sending and/or receiving data generated by other nodes on the network.,Distributed ProcessingNetwork CriteriaPhysical StructuresNetwork ModelsCategories of NetworksInterconnection of Networks:Internetwork,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chapter01,1.6,Figure 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chapter01,1.7,Figure 1.4 Categories of topology,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chapter01,1.8,Figure 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chapter01,1.9,Figure 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chapter01,1.10,Figure 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chapter01,1.11,Figure 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chapter01,1.12,Figure 1.9 A hybrid topology:a star backbone with three bus networks,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chapter01,1.13,Figure 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chapter01,1.14,Figure 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数据通信与网络chapter01数据通信与网络chapter01,1.15,Figure 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chapter01,1.16,1-3 THE INTERNET,The Internet has revolutionized 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 Internet is a communication system that has brought a wealth of information to our fingertips and organized it for our use.,A Brief HistoryThe Internet Today(ISPs),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chapter01,1.17,Figure 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chapter01,1.18,1-4 PROTOCOLS AND STANDARDS,In this section,we define two widely used terms:protocols and standards.First,we define protocol,which is synonymous with rule.Then we discuss standards,which are agreed-upon rules.,ProtocolsStandardsStandards OrganizationsInternet Standards,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chapter01,
