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Figure 13.1 An example of point-to-point connectivity Figure 13.2 A client-server network Figure 13.3 A typical data packet Figure 13.4 The layers of the OSI model Figure 13.5 Passing a message through an intermediate node Figure 13.6 A comparison of OSI and TCP/IP Figure 13.7 LAN topologies: (a) ring topology, (b) bus topology, (c) star topology Figure 13.7 (continued) Figure 13.7 (continued) Figure 13.8 Switched Ethernet Figure 13.9 A Switched wide area network Source: BUSINESS DATA COMMUNICATIONS 2/E by Stallings/Van Slyke, © 1997. Reprinted by permission of Prentice-Hall, Upper Saddle River, NJ. Figure 13.10 Cluster models