1. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 1 Version 4.0 Services in a Converged WAN Accessing the WAN – Chapter 1

2. © 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.

3. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 3 How ECNM Provides Integrated Services over an Enterprise Network  Data network that works beyond LAN’s

4. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 4 How ECNM Provides Integrated Services over an Enterprise Network WAN’S CARACTERISTHICS  Connect devices that are separated by a larger geographical area than a LAN can cover  Use the services of carriers, such as companies providing telephone services, suppliers of cable, satellite systems, and network service providers.  Use serial connections of various types to provide access to bandwidth across wide geographical areas.

5. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 5 How ECNM Provides Integrated Services over an Enterprise Network  The Enterprise’s changing network topology

6. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 6 How ECNM Provides Integrated Services over an Enterprise Network  The Enterprise’s changing network topology Campus

7. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 7 How ECNM Provides Integrated Services over an Enterprise Network  The Enterprise’s changing network topology Branch

8. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 8 How ECNM Provides Integrated Services over an Enterprise Network  The Enterprise’s changing network topology Distributed

9. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 9 How ECNM Provides Integrated Services over an Enterprise Network  The Hierarchical Design Model

10. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 10 How ECNM Provides Integrated Services over an Enterprise Network  The Hierarchical Design Model

11. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 11 How ECNM Provides Integrated Services over an Enterprise Network  The Hierarchical Design Model that Cisco's Enterprise Composite Model has been designed to address

12. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 12 How ECNM Provides Integrated Services over an Enterprise Network  The purpose of Cisco Enterprise Architectures

13. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 13 How ECNM Provides Integrated Services over an Enterprise Network  The purpose of Cisco Enterprise Architectures

14. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 14 the Key WAN Technology Concepts  WAN functions in terms of the OSI Reference Model Phisical layer protocols describe how to provide electrical, mechanical, operational and functional to the services provided by a communications service provider. Layer 2 protocols define how data is encapsulated to be sent to remote destination.

15. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 15 The Key WAN Technology Concepts  The key WAN physical layer concepts for network and Internet communications provide an interface for connecting subscribers to a communication link on the WAN cloud. Client devices Set point in a building to separate customer equipment from the service provider's equipment. Copper telephone cable or fiber that connects the CPE subscriber site to the service provider's CO. The local loop is sometimes called "last mile". building facilities or local service provider where the phone cables are linked with fiber communication lines

16. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 16 The Key WAN Technology Concepts  The key WAN physical layer concepts for network and Internet communications Modulates an analog carrier signal to encode digital information and demodulates the carrier signal to decode the transmitted information. CSU provides termination for the digital signal, The DSU converts the frames of the line carrier T in the LAN frames that can be interpreted and vice versa. Commute traffic as Frame Relay, ATM or X.25, and operate in the data link layer of the OSI reference model. Must support multiple telecommunications interfaces of the highest speed that is used in the core of the WAN and be able to forward IP packets at full speed on all those interfaces

17. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 17 The Key WAN Technology Concepts  The key WAN data link layer protocols used in today’s Enterprise WAN networks

18. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 18 The Key WAN Technology Concepts  The key WAN data link layer protocols used in today’s Enterprise WAN networks

19. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 19 The Key WAN Technology Concepts  The switching technologies used for WANs in an Enterprise setting

20. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 20 Select the Appropriate WAN Technology to meet ECNM Requirements  Connecting subscribers to the WAN

21. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 21 Select the Appropriate WAN Technology to meet ECNM Requirements  How Enterprises use leased line services to provide a WAN connection

22. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 22 Select the Appropriate WAN Technology to meet ECNM Requirements  The circuit switching options available to provide a WAN connection

23. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 23 Select the Appropriate WAN Technology to meet ECNM Requirements  The packet switching options available to provide a WAN connection

24. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 24 Select the Appropriate WAN Technology to meet ECNM Requirements  Frame Relay

25. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 25 Select the Appropriate WAN Technology to meet ECNM Requirements  Asynchronous Transfer Mode - ATM

26. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 26 Select the Appropriate WAN Technology to meet ECNM Requirements  List of factors to consider when selecting a WAN connection

27. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 27 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

28. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 28 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

29. © 2006 Cisco Systems, Inc. All rights reserved.Cisco Public 29