Accessing the WAN

© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public
1
Version 4.0
Services in a Converged
WAN
Accessing the WAN – Chapter 1
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public
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 Public
3
Describe How ECNM Provides Integrated
Services over an Enterprise Network
 Explain the purpose and function of WANs


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4
Describe How ECNM Provides Integrated
Services over an Enterprise Network
 Describe the stages of business growth, the
corresponding business requirements for services and
how those requirements are reflected in the

Enterprise’s changing network topology


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5
Describe How ECNM Provides Integrated
Services over an Enterprise Network
 Describe the problems with the Hierarchical Design
Model that Cisco's Enterprise Composite Model has
been designed to address


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


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


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8
Describe the Key WAN Technology

Concepts
 Describe the key WAN physical layer concepts for
network and Internet communications


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Describe the Key WAN Technology
Concepts
 Describe the key WAN data link layer protocols used in
today’s Enterprise WAN networks


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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 Public
11
Select the Appropriate WAN Technology to meet
ECNM Requirements
 List the various options for connecting subscribers to
the WAN


© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public

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


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13
Select the Appropriate WAN Technology to meet
ECNM Requirements
 Describe the circuit switching options available to
provide a WAN connection


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Select the Appropriate WAN Technology to meet
ECNM Requirements
 Describe the packet switching options available to
provide a WAN connection


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15
Select the Appropriate WAN Technology to meet
ECNM Requirements
 List factors to consider when selecting a WAN
connection

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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


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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
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18
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public
1
Version 4.0
Point-to-Point Protocol
(PPP)
Accessing the WAN – Chapter 2
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public
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.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public
3

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


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4
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


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5
Describe the Fundamental Concepts of
Point-to-Point Serial Communication
 Define the location of the demarcation point relative to
customer and service provider networks

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6
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

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7

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