1. 1 CCNA 4 v3.1 Module 3

2. 2 CCNA 4 v3.0 Module 3 PPP

3. 333 Objectives Serial point-to-point links PPP authentication Configuring PPP

4. 444 Introduction to Serial Communication Some of the many serial communications standards include the following: RS-232-E V.35 High-Speed Serial Interface (HSSI)

5. 555 Time-Division Multiplexing

6. 666 Demarcation Point The point in the network where the responsibility of the service provider or "telco" ends.

7. 777 DTE-DCE

8. 888 Serial Connection Options

9. 999 HDLC Encapsulation

10. 10 Configuring HDLC Encapsulation

11. 11 Troubleshooting a Serial Interface Five possible problem states can be identified in the interface status line of the show interface serial display: Serial x is down, line protocol is down. Serial x is up, line protocol is down. Serial x is up, line protocol is up (looped). Serial x is up, line protocol is down (disabled). Serial x is administratively down, line protocol is down.

12. 12 PPP Layered Architecture

13. 13 PPP and the Data Link Layer

14. 14 PPP and the Network Layer

15. 15 Establishing a PPP Session

16. 16 PPP Operation

17. 17 LCP Options

18. 18 PPP Configuration Options

19. 19 NCP

20. 20 PPP Authentication Protocols

21. 21 PPP Authentication

22. 22 Password Authentication Protocol (PAP)

23. 23 Challenge Handshake Authentication Protocol (CHAP) CHAP provides protection against playback attack through the use of a variable challenge value that is unique and unpredictable.

24. 24 PPP Encapsulation and Authentication Process

25. 25 CHAP Authentication Process

26. 26 Configuring PPP

27. 27 Configuring PPP Authentication

28. 28 PAP Configuration

29. 29 CHAP Configuration

30. 30 Verifying PPP

31. 31 PPP Configuration Commands

32. 32 Debug PPP Authentication