1、Chapter 1IntroductionCopyright The McGraw-Hill Companies,Inc.Permission required for reproduction or display.1ComponentsData RepresentationData Flow2Figure 1.1 Five components of data communication3Figure 1.2 Data flow(simplex,half-duplex,and full-duplex)4Distributed ProcessingNetwork CriteriaPhysic
2、al StructuresNetwork ModelsCategories of NetworksInterconnection of Networks:Internetwork5Figure 1.3 Types of connections:point-to-point and multipoint6Figure 1.4 Categories of topology7Figure 1.5 A fully connected mesh topology(five devices)8Figure 1.6 A star topology connecting four stations9Figur
3、e 1.7 A bus topology connecting three stations10Figure 1.8 A ring topology connecting six stations11Figure 1.9 A hybrid topology:a star backbone with three bus networks12Figure 1.10 An isolated LAN connecting 12 computers to a hub in a closet13Figure 1.11 WANs:a switched WAN and a point-to-point WAN14Figure 1.12 A heterogeneous network made of four WANs and two LANs15A Brief HistoryThe Internet Today(ISPs)16Figure 1.13 Hierarchical organization of the Internet17ProtocolsStandardsStandards OrganizationsInternet Standards18
