© 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 I Chapter Providing Integrated Services to the Enterprise Accessing the WAN – Chapter 1

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 4 The purpose and function of WANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 5 The Evolving Enterprise Network

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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 7 The Enterprise Architecture Enterprise Campus Architecture Enterprise Branch Architecture Enterprise Data Center Architecture Enterprise Teleworker Architecture Some examples of the modules: Different businesses need different types of networks.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 8 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.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 9 Example topology

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter WAN technology overview Accessing the WAN – Chapter 1

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 11 Describe the Key WAN Technology Concepts WAN operations focus primarily on Layer 1 and Layer 2.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 12 WAN Physical Layer Terminology  Customer Premises Equipment  Data Communications Equipment  Data Terminal Equipment  Demarcation Point

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 13 WAN Devices

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 14 WAN Physical Layer Standards

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 15 WAN Data Link Layer Standards

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 16 WAN Frame Encapsulation Formats

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 17 Circuit Switching

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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter Internet Connection Options Accessing the WAN – Chapter 1

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 20 Various options for connecting subscribers to the WAN

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 21 Leased line

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 22 Circuit switching options

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 23 Packet switching options X25 Frame Relay ATM

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 24 Broadband Services  ADSL  Cable  Wireless (WiMax)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 25 VPN Technology

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 26 Metro Ethernet

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 27 Factors to consider when selecting a WAN connection

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 28 Factors to consider when selecting a WAN connection (cont.)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 29 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 30 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 31 Next Module

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 32