Services in a Converged WAN

1. Services in a Converged WAN Accessing the WAN– Chapter 1

2. Objectives • Describe how the Cisco Enterprise Composite Model (ECNM) provides integrated services over an Enterprise network. • Describe the key WAN technology concepts. • Identify the appropriate WAN technologies to use when matching ECNM best practices with typical enterprise requirements for WAN communications.

3. Describe How ECNM Provides Integrated Services over an Enterprise Network • Explain the purpose and function of WANs

4. Describe How ECNM Provides Integrated Services over an Enterprise Network • Business growth

5. Describe How ECNM Provides Integrated Services over an Enterprise Network • Cisco Enterprise Network Architecture Modules

6. Describe How ECNM Provides Integrated Services over an Enterprise Network • Explain the purpose of Cisco Enterprise Architectures

7. Describe the Key WAN Technology Concepts • Describe WAN functions in terms of the OSI Reference Model

8. Describe the Key WAN Technology Concepts

9. WAN Data-Link-Layer protocols

10. Describe the Key WAN Technology Concepts • Describe the switching technologies used for WANs in an Enterprise setting

11. Connecting subscribers to WAN link

12. Select the Appropriate WAN Technology to meet ECNM Requirements • Describe how Enterprises use leased line services to provide a WAN connection

13. Circuit Switching options

14. Packet switching options

15. Factors to consider in WAN

16. Summary • A WAN is defined as • A data communications network that operates beyond the geographic scope of a LAN • WAN primarily operate on layer 1 & 2 of the OSI model • WAN technologies include • Leased line • ISDN • Frame relay • X.25 • ATM

17. Summary • Cisco Enterprise Architecture • This is an expansion of the hierarchical model that further divides the enterprise network into • Physical areas • Logical areas • Functional areas • Selecting the appropriate WAN technology requires considering some of the following: • WAN’s purpose • Geographic scope of WAN • Traffic requirements • If WAN uses a public or private infrastructure

19. Point-to-Point Protocol (PPP) Accessing the WAN– Chapter 2

20. Objectives • Describe the fundamental concepts of point-to-point serial communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting. • Describe PPP concepts including PPP layered architecture, PPP frame structure, PPP session establishment, multiprotocol encapsulation support, link control protocol (LCP), network control protocol (NCP), and Internet Protocol Control Protocol (IPCP). • Configure PPP on a serial interface including enabling PPP encapsulation, verifying the PPP connection and troubleshooting encapsulation problems. • Configure PPP authentication including explaining PAP and CHAP authentication protocols, configuring PPP authentication using PAP and CHAP, and troubleshooting PPP authentication problems.

21. Describe the Fundamental Concepts of Point-to-Point Serial Communication • Describe the concept of serial communication as the basis of WAN technologies

22. Describe the Fundamental Concepts of Point-to-Point Serial Communication • Explain how two or more data streams are transported across a single physical connection using TDM

23. Describe the Fundamental Concepts of Point-to-Point Serial Communication • Define the location of the demarcation point relative to customer and service provider networks

24. Describe the Fundamental Concepts of Point-to-Point Serial Communication • Explain the terms DTE and DCE with relative to the location of devices in a network

25. Describe the Fundamental Concepts of Point-to-Point Serial Communication • Describe how high-level data link control (HDLC) uses one of three frame types to encapsulate data

26. Describe the Fundamental Concepts of Point-to-Point Serial Communication • Explain when and how to configure HDLC encapsulation on a router

27. Describe Point-to-Point Concepts • Describe PPP in terms of its use in WAN links

28. Describe Point-to-Point Concepts • Describe the general function of each layer of PPP architecture

29. Describe Point-to-Point Concepts • Define the three phases of PPP session establishment

30. Describe Point-to-Point Concepts • Explain the role of the LCP in PPP

31. Describe Point-to-Point Concepts

32. Configuring PPP with Authentication • Differentiate between PAP and CHAP

33. Configuring PPP with Authentication • Describe how to use PAP to authenticate a PPP connection

34. Configuring PPP with Authentication • Describe how to use CHAP to authenticate a PPP connection

35. Configuring PPP with Authentication • Outline the PPP encapsulation and authentication process on a flow chart

36. Configuring PPP

37. Configuring PPP with Authentication • Explain how to configure a PPP connection with authentication

38. Configuring PPP with PAP Authentication Left(config)# interface Serial 0/0 Left(config-if)# ip address 192.168.1.1 255.255.255.252 Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication pap Right(config)# interface Serial 0/0 Right(config-if)# ip address 192.168.1.2 255.255.255.252 Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap Configuration of Serial interface, addressing scheme

39. Configuring PPP with PAP Authentication Left(config)# interface Serial 0/0 Left(config-if)# ip address 192.168.1.1 255.255.255.252 Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication pap Right(config)# interface Serial 0/0 Right(config-if)# ip address 192.168.1.2 255.255.255.252 Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap Activation of PPP encapsulation, specify authentication type

40. Configuring PPP with PAP Authentication Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication pap Left(config-if)# ppp pap sent-username Left password LE Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap Right(config-if)# ppp pap sent-username Right password RI Set credentials that are sent during authentication

41. Configuring PPP with PAP Authentication Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication pap Left(config-if)# ppp pap sent-username Left password LE Left(config)# username Right password RI Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap Right(config-if)# ppp pap sent-username Right password RI Right(config)# username Left password LE Set credentials, that are verified during authentication

42. Configuring PPP with CHAP Authentication Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication chap Left(config-if)# ppp chap hostname Left Left(config-if)# ppp chap password LE Left(config)# username Right password RI What is the difference when Configuring the same witch CHAP? Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication chap Right(config-if)# ppp chap hostname Right Right(config-if)# ppp chap password RI Right(config)# username Left password LE

43. Configure PPP on a Serial Interface • Explain the output of the show interfaces serial command

44. Configure PPP on a Serial Interface • Explain the output of the debug ppp command

45. Debugging PPP • Explain the output of the debug ppp authentication command

46. Summary • PPP is a widely used WAN protocol • PPP provides multi-protocol LAN to WAN connections • PPP session establishment – 4 phases • Link establishment • Link quality determination • Network layer protocol configuration negotiation • Link termination • WAN Encapsulation • HDLC default encapsulation • PPP

47. Summary • PPP authentication • PAP • 2 way handshake • CHAP • 3 way handshake • Use debug ppp authentication to confirm authentication configuration • PPP configuration • Done on a serial interface • After PPP configuration, use show interfaces command to display: • LCP state • NCP state