Services in a Converged
WAN
Accessing the WAN – Chapter 1
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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.
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1.1 Providing Integrated
Services to the Enterprise
Accessing the WAN – Chapter 1
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The purpose and function of WANs
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The Evolving Enterprise Network
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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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The Enterprise Architecture
Different businesses
need different types of
networks.
Some examples
of the modules:
Enterprise Campus Architecture
Enterprise Branch Architecture
Enterprise Data Center Architecture
Enterprise Teleworker Architecture
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Modules in the Enterprise Architecture
The Cisco Enterprise Architecture consists of modules representing
focused views that target each place in the network. Each module has a
distinct network infrastructure with services and network applications that
extend across the modules.
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Example topology
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The Evolving Network Model: Activity
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1.2 WAN technology
overview
Accessing the WAN – Chapter 1
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Describe the Key WAN Technology
Concepts
WAN operations focus primarily on Layer 1 and Layer 2.
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WAN Physical Layer Terminology
 Customer Premises
Equipment
 Data
Communications
Equipment
 Data Terminal
Equipment
 Demarcation Point
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WAN Devices
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WAN Physical Layer Standards
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WAN Data Link Layer Standards
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WAN Frame Encapsulation Formats
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Circuit Switching
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Packet Switching
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1.3 Internet Connection Options
Accessing the WAN – Chapter 1
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Various options for connecting subscribers to the WAN
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Internet Connection Options: Activity
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Leased line
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Circuit switching options
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Packet switching options
X25
Frame Relay
ATM
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Broadband Services
 ADSL
 Cable
 Wireless (WiMax)
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VPN Technology
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Metro Ethernet
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Factors to consider when selecting a WAN
connection
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Factors to consider when selecting a WAN
connection (cont.)
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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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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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Next Module
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