1. Chapter 17 X.25

2. Figure 17-1 X.25

3. Figure 17-2 X.25 Layers in Relation to the OSI Layers

4. Figure 17-3 Format of a Frame

5. Figure 17-4 Addressing at the Frame Layer

6. Figure 17-5 Three Phases of the Frame Layer

7. Figure 17-6 Frame Layer and Packet Layer Domains

8. Figure 17-7 Virtual Circuits in X.25

9. Figure 17-8 LCNs in X.25

10. Figure 17-9 LCN Assignments

11. Figure 17-10 PLP Packet Format

12. Figure 17-11 Categories of PLP Packets

13. Figure 17-12 Data Packets in the PLP Layer

14. Figure 17-13 RR, RNR, and REJ Packets

15. Figure 17-14 Other Control Packets

16. Figure 17-15 Control Packet Formats

17. Figure 17-16 X.25 Address Format

18. Figure 17-17 Triple-X Protocols