services in a converged wan

© 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.


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


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


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


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


Describe the Key WAN Technology Concepts Describe WAN functions in terms of the OSI Reference

Model


Describe the Key WAN Technology Concepts


WAN Data-Link-Layer protocols


Describe the Key WAN Technology Concepts Describe the switching technologies used for WANs in

an Enterprise setting


Connecting subscribers to WAN link


Select the Appropriate WAN Technology to meet ECNM Requirements

Describe how Enterprises use leased line services to provide a WAN connection


Circuit Switching options


Packet switching options


Factors to consider in WAN


Summary

A WAN is defined asA 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


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 I Chapter 6 19

Point-to-Point Protocol (PPP)

Accessing the WAN – Chapter 2


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.


Describe the Fundamental Concepts of Point-to-Point Serial Communication Describe the concept of serial communication as the

basis of WAN technologies


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


Describe the Fundamental Concepts of Point-to-Point Serial Communication Define the location of the demarcation point relative to

customer and service provider networks


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


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


Describe the Fundamental Concepts of Point-to-Point Serial Communication Explain when and how to configure HDLC

encapsulation on a router


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


Describe Point-to-Point Concepts Describe the general function of each layer of PPP

architecture


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


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


Describe Point-to-Point Concepts


Configuring PPP with Authentication Differentiate between PAP and CHAP


Configuring PPP with Authentication Describe how to use PAP to authenticate a PPP

connection


Configuring PPP with Authentication Describe how to use CHAP to authenticate a PPP

connection


Configuring PPP with Authentication Outline the PPP encapsulation and authentication

process on a flow chart


Configuring PPP


Configuring PPP with Authentication Explain how to configure a PPP connection with

authentication


Configuring PPP with PAP Authentication

Left(config)# interface Serial 0/0Left(config-if)# ip address 192.168.1.1 255.255.255.252Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication pap

Configuration of Serial interface, addressing scheme

Right(config)# interface Serial 0/0Right(config-if)# ip address 192.168.1.2 255.255.255.252Right(config-if)# encapsulation pppRight(config-if)# ppp authentication pap



Left(config)# interface Serial 0/0Left(config-if)# ip address 192.168.1.1 255.255.255.252Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication pap

Activation of PPP encapsulation, specify authentication type

Right(config)# interface Serial 0/0Right(config-if)# ip address 192.168.1.2 255.255.255.252Right(config-if)# encapsulation pppRight(config-if)# ppp authentication pap



Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication papLeft(config-if)# ppp pap sent-username Left password LE

Set credentials that are sent during authentication

Right(config-if)# encapsulation pppRight(config-if)# ppp authentication papRight(config-if)# ppp pap sent-username Right password RI



Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication papLeft(config-if)# ppp pap sent-username Left password LELeft(config)# username Right password RI

Set credentials, that are verified during authentication

Right(config-if)# encapsulation pppRight(config-if)# ppp authentication papRight(config-if)# ppp pap sent-username Right password RIRight(config)# username Left password LE


Configuring PPP with CHAP Authentication

Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication chapLeft(config-if)# ppp chap hostname LeftLeft(config-if)# ppp chap password LELeft(config)# username Right password RI

Right(config-if)# encapsulation pppRight(config-if)# ppp authentication chapRight(config-if)# ppp chap hostname RightRight(config-if)# ppp chap password RIRight(config)# username Left password LE

What is the difference whenConfiguring the same witch CHAP?


Configure PPP on a Serial Interface Explain the output of the show interfaces serial

command


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


Debugging PPP Explain the output of the debug ppp authentication

command


Summary

PPP is a widely used WAN protocol

PPP provides multi-protocol LAN to WAN connections

PPP session establishment – 4 phasesLink establishment

Link quality determination

Network layer protocol configuration negotiation

Link termination

WAN Encapsulation–HDLC default encapsulation

–PPP


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

services in a converged wan

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