1. 1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 4 v3.0 Module 3 PPP

2. 222 © 2003, Cisco Systems, Inc. All rights reserved. Purpose of This PowerPoint This PowerPoint primarily consists of the Target Indicators (TIs) of this module in CCNA version 3.0. It was created to give instructors a PowerPoint to take and modify as their own. This PowerPoint is: NOT a study guide for the module final assessment. NOT a study guide for the CCNA certification exam. Please report any mistakes you find in this PowerPoint by using the Academy Connection Help link.

3. 333 © 2003, Cisco Systems, Inc. All rights reserved. To Locate Instructional Resource Materials on Academy Connection: Go to the Community FTP Center to locate materials created by the instructor community Go to the Tools section Go to the Alpha Preview section Go to the Community link under Resources See the resources available on the Class home page for classes you are offering Search http://www.cisco.comhttp://www.cisco.com Contact your parent academy!

4. 444 © 2003, Cisco Systems, Inc. All rights reserved. Objectives Serial point-to-point links PPP authentication Configuring PPP

5. 555 © 2003, Cisco Systems, Inc. All rights reserved. Introduction to Serial Communication Some of the many serial communications standards include the following: RS-232-E V.35 High-Speed Serial Interface (HSSI)

6. 666 © 2003, Cisco Systems, Inc. All rights reserved. Time-Division Multiplexing

7. 777 © 2003, Cisco Systems, Inc. All rights reserved. Demarcation Point The point in the network where the responsibility of the service provider or "telco" ends.

8. 888 © 2003, Cisco Systems, Inc. All rights reserved. DTE-DCE

9. 999 © 2003, Cisco Systems, Inc. All rights reserved. Serial Connection Options

10. 10 © 2003, Cisco Systems, Inc. All rights reserved. HDLC Encapsulation

11. 11 © 2003, Cisco Systems, Inc. All rights reserved. Configuring HDLC Encapsulation

12. 12 © 2003, Cisco Systems, Inc. All rights reserved. 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.

13. 13 © 2003, Cisco Systems, Inc. All rights reserved. PPP Layered Architecture

14. 14 © 2003, Cisco Systems, Inc. All rights reserved. PPP and the Data Link Layer

15. 15 © 2003, Cisco Systems, Inc. All rights reserved. PPP and the Network Layer

16. 16 © 2003, Cisco Systems, Inc. All rights reserved. Establishing a PPP Session

17. 17 © 2003, Cisco Systems, Inc. All rights reserved. PPP Operation

18. 18 © 2003, Cisco Systems, Inc. All rights reserved. LCP Options

19. 19 © 2003, Cisco Systems, Inc. All rights reserved. PPP Configuration Options

20. 20 © 2003, Cisco Systems, Inc. All rights reserved. NCP

21. 21 © 2003, Cisco Systems, Inc. All rights reserved. PPP Authentication Protocols

22. 22 © 2003, Cisco Systems, Inc. All rights reserved. PPP Authentication

23. 23 © 2003, Cisco Systems, Inc. All rights reserved. Password Authentication Protocol (PAP)

24. 24 © 2003, Cisco Systems, Inc. All rights reserved. Challenge Handshake Authentication Protocol (CHAP) CHAP provides protection against playback attack through the use of a variable challenge value that is unique and unpredictable.

25. 25 © 2003, Cisco Systems, Inc. All rights reserved. PPP Encapsulation and Authentication Process

26. 26 © 2003, Cisco Systems, Inc. All rights reserved. CHAP Authentication Process

27. 27 © 2003, Cisco Systems, Inc. All rights reserved. Configuring PPP

28. 28 © 2003, Cisco Systems, Inc. All rights reserved. Configuring PPP Authentication

29. 29 © 2003, Cisco Systems, Inc. All rights reserved. PAP Configuration

30. 30 © 2003, Cisco Systems, Inc. All rights reserved. CHAP Configuration

31. 31 © 2003, Cisco Systems, Inc. All rights reserved. Verifying PPP

32. 32 © 2003, Cisco Systems, Inc. All rights reserved. PPP Configuration Commands

33. 33 © 2003, Cisco Systems, Inc. All rights reserved. Debug PPP Authentication