1. Figure 2-11 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998

2. Figure 2-12 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Simplex

3. Figure 2-13 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Half-Duplex

4. Figure 2-14 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Full-Duplex

5. Figure 2-15 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998

6. Figure 2-16 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Local Area Network

7. Figure 2-16-continued WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Local Area Network

8. Figure 2-17 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Metropolitan Area Network

9. Figure 2-18 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Wide Area Network

10. Figure 2-19 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Internetwork (Internet)