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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE I
Chapter 6 1
Introduction to WAN
Accessing the WAN Chapter 1
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 2
Objectives
Introduction to WAN WAN technology concepts Internet connection
options
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Chapter 6 3
The purpose and function of WANs
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Chapter 6 4
The Hierarchical Design Model
Access layer - Grants user access to network
devices.Distribution layer - aggregates WAN connections at the edge
of the campus and provides policy-based connectivity.Core layer -
high-speed backbone that is designed to switch packets as fast as
possible.
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 5
The Enterprise Architecture
Enterprise Campus ArchitectureEnterprise Branch
ArchitectureEnterprise Data Center ArchitectureEnterprise
Teleworker Architecture
Some examples of the modules:
Different businesses need different types of networks.
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 6
Describe the Key WAN Technology Concepts
WAN operations focus primarily on Layer 1 and Layer 2.
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 7
WAN Physical Layer Terminology
Customer Premises Equipment
Data Communications Equipment
Data Terminal Equipment
Demarcation Point
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Chapter 6 8
WAN Physical Layer Standards
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 9
WAN Data Link Layer Standards
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 10
WAN Frame Encapsulation Formats
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Chapter 6 11
Various options for connecting subscribers to the WAN
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Chapter 6 12
Circuit Switching
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Chapter 6 13
Packet Switching
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Chapter 6 14
Leased line
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Chapter 6 15
VPN Technology
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 16
Factors to consider when selecting a WAN connection
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Chapter 6 17
Factors to consider when selecting a WAN connection (cont.)
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Chapter 6 18
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 lineISDNFrame relayX.25ATM
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 19
Summary Cisco Enterprise Architecture
This is an expansion of the hierarchical model that further
divides the enterprise network into
Physical areasLogical areasFunctional areas
Selecting the appropriate WAN technology requires considering
some of the following:
WANs purposeGeographic scope of WANTraffic requirementsIf WAN
uses a public or private infrastructure
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2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1
Chapter 6 20
