© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter 6 1 Services in a Converged WAN Accessing the WAN – Chapter 1

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 3 Describe How ECNM Provides Integrated Services over an Enterprise Network  Explain the purpose and function of WANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 4 Describe How ECNM Provides Integrated Services over an Enterprise Network  Business growth

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 5 Describe How ECNM Provides Integrated Services over an Enterprise Network  Cisco Enterprise Network Architecture Modules

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 6 Describe How ECNM Provides Integrated Services over an Enterprise Network  Explain the purpose of Cisco Enterprise Architectures

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 7 Describe the Key WAN Technology Concepts  Describe WAN functions in terms of the OSI Reference Model

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 8 Describe the Key WAN Technology Concepts

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 9 WAN Data-Link-Layer protocols

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 10 Describe the Key WAN Technology Concepts  Describe the switching technologies used for WANs in an Enterprise setting

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 11 Connecting subscribers to WAN link

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 12 Select the Appropriate WAN Technology to meet ECNM Requirements  Describe how Enterprises use leased line services to provide a WAN connection

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 13 Circuit Switching options

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 14 Packet switching options

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 15 Factors to consider in WAN

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 18

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter 6 19 Point-to-Point Protocol (PPP) Accessing the WAN – Chapter 2

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 21 Describe the Fundamental Concepts of Point-to-Point Serial Communication  Describe the concept of serial communication as the basis of WAN technologies

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 26 Describe the Fundamental Concepts of Point-to-Point Serial Communication  Explain when and how to configure HDLC encapsulation on a router

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 27 Describe Point-to-Point Concepts  Describe PPP in terms of its use in WAN links

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 28 Describe Point-to-Point Concepts  Describe the general function of each layer of PPP architecture

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 29 Describe Point-to-Point Concepts  Define the three phases of PPP session establishment

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 30 Describe Point-to-Point Concepts  Explain the role of the LCP in PPP

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 31 Describe Point-to-Point Concepts

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 32 Configuring PPP with Authentication  Differentiate between PAP and CHAP

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 33 Configuring PPP with Authentication  Describe how to use PAP to authenticate a PPP connection

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 34 Configuring PPP with Authentication  Describe how to use CHAP to authenticate a PPP connection

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 35 Configuring PPP with Authentication  Outline the PPP encapsulation and authentication process on a flow chart

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 36 Configuring PPP

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 37 Configuring PPP with Authentication  Explain how to configure a PPP connection with authentication

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 38 Configuring PPP with PAP Authentication Left(config)# interface Serial 0/0 Left(config-if)# ip address Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication pap Configuration of Serial interface, addressing scheme Right(config)# interface Serial 0/0 Right(config-if)# ip address Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 39 Configuring PPP with PAP Authentication Left(config)# interface Serial 0/0 Left(config-if)# ip address Left(config-if)# encapsulation ppp Left(config-if)# ppp authentication pap Activation of PPP encapsulation, specify authentication type Right(config)# interface Serial 0/0 Right(config-if)# ip address Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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 Set credentials that are sent during authentication Right(config-if)# encapsulation ppp Right(config-if)# ppp authentication pap Right(config-if)# ppp pap sent-username Right password RI

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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 Set credentials, that are verified during authentication 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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 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 What is the difference when Configuring the same witch CHAP?

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 43 Configure PPP on a Serial Interface  Explain the output of the show interfaces serial command

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 44 Configure PPP on a Serial Interface  Explain the output of the debug ppp command

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 45 Debugging PPP  Explain the output of the debug ppp authentication command

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 48