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Learn about the different types of networks - Local Area Networks (LANs), Metropolitan Area Networks (MANs), and Wide Area Networks (WANs). Understand the various connecting devices and the OSI layers in which they operate. Explore the client-server model, the OSI model, and TCP/IP. Gain knowledge about the rationale behind the existence of networks.
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Chapter 6 ComputerNetworks
OBJECTIVES Distinguish between the three types of networks: LANs, MANs,and WANs. List different connecting devices and the OSI layers in whicheach device operates. Understand client-server models. Understand the OSI model and TCP/IP. Understand the rationale for the existence of networks. After reading this chapter, the reader should be able to:
6.1 NETWORKS, LARGE AND SMALL (LAN, MAN, WAN)
6.2 OSI MODEL
Note: The Open Systems Interconnection modelis a theoretical model that shows howany two different systems can communicate with each other.
Figure 6-1 The OSI model
Figure 6-2 Flow of data in the OSI model User network Coding methods Synchronization points Entire message Packet (logical address) Frames (node node) Bit stream signal
6.3 CATEGORIES OF NETWORKS
Figure 6-3 Categories of networks
Figure 6-4 LANs
Figure 6-5 MAN
Figure 6-6 WAN
6.4 CONNECTING DEVICES
Figure 6-7 Connecting devices
Figure 6-8 Repeater
Note: Repeaters operate at the first layer of theOSI model.
Figure 6-9 Bridge
Note: Bridges operate at the first two layersof the OSI model.
Figure 6-10 Switch
Note: Routers operate at the first three layersof the OSI model.
Figure 6-11 Routers in an internet
Figure 6-12 Connecting devices and the OSI model Router 和 Gateway 現在不太區別了
6.5 THE INTERNET AND TCP/IP
Figure 6-13 TCP/IP and OSI model
Figure 6-14 IP addresses in dotted-decimal notation
Figure 6-15 Client-server model
Figure 6-16 FTP
Figure 6-17 SMTP
Figure 6-18 Email address
Figure 6-19 TELNET
Figure 6-20 URL
Figure 6-21 Browser
Figure 6-22 Categories of Web documents
