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Chapter 1   services in a converged wan
 

Chapter 1 services in a converged wan

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  • Graphic 1.1.1.1
  • Graphic 1.1.2.1
  • Graphic 1.1.1.1
  • Graphic 1.1.3.2
  • Graphic 1.1.3.3 Determine w/c devices are for core, distrib., and access
  • Graphic 1.2.1.1 Only physical & data link is changed ATM – asynchronous transfer mode HDLC – high level data link control – used instead of clock in RT to RT comm before
  • Graphic 1.2.2.1 If space permits add graphics 1.2.2.2 & 1.2.2.3 (if forced to make a choice between the 2 graphic pick 1.2.2.2) PSTN devices – multiplexer (time division and frequency division multiplexing) used in switches
  • Graphic 1.2.3.1 Ppp- rt to rt
  • Graphic 1.2.4.1 Circuit-switching for telephone Packet-switching for computers (SMS and email) We can’t use packet-switching for telephone calls because it divides packets We can use circuit-switching for transmitting packets Alternative graphic can be found at the following URL (not necessary to use – just a thought): http://www.cisco.com/image/jpg/en/us/guest/products/ps6438/c1244/cdccont_0900aecd802c2010_0900aecd802c2010-08.jpg graphic 1.2.4.2 Delays (latency) and variability of delay (jitter) are greater in packet-switched than in circuit-switched networks. This is because the links are shared, and packets must be entirely received at one switch before moving to the next.
  • Graphic 1.3.1.1
  • Graphic 1.3.2.1 Broadband has modulation for transmission to diff. channels Leased line uses dedicated line Telephone lines use analog communication
  • Graphics 1.3.3.1 & 1.3.3.2
  • Graphic 1.3.4.1
  • The objective stated above does not make sense to me. Reword the above objective as follows: List factors to consider when selecting a WAN connection Graphic 1.3.5.4

Chapter 1   services in a converged wan Chapter 1 services in a converged wan Presentation Transcript

  • Services in a Converged WAN Accessing the WAN – Chapter 1ITE I Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  • 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.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  • Wide Area Networks WAN An enterprise must subscribe LAN connects computers, peripherals, and other to a WAN service provider to devices in a single building or other small use WAN carrier network geographic area services. A WAN is a data communications network that operates beyond the geographic scope of a LAN. WAN allows the transmission of data across greater geographic distances WANs use facilities provided by a service provider, or carrier. WANs use serial connections.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  • WAN’s – The need  Sharing of data  Organization to organization  Remote users  Over large distance  LAN – Falls short  Company GrowthITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  • Evolving Enterprise  Stages of business growth.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  • The Evolving Network ModelITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  • Describe How ECNM Provides Integrated Services over an Enterprise Network  Problems with the Hierarchical Design Model that Ciscos Enterprise Composite Model has been designed to addressITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  • Describe How ECNM Provides Integrated Services over an Enterprise Network  Explain the purpose of Cisco Enterprise ArchitecturesITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  • Key WAN Technology Concepts  WAN functions in terms of the OSI Reference Model The physical layer (OSI Layer 1) protocols describe how to provide electrical, mechanical, operational, and functional connections to the services of a communications service provider. The data link layer (OSI Layer 2) protocols define how data is encapsulated for transmission toward a remote location and the mechanisms for transferring the resulting frames. A variety of different technologies are used, such as Frame Relay and ATM. Some of these protocols use the same basic framing mechanism, High-Level Data Link Control (HDLC), an ISO standard, or one of its subsets or variants.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  • Key WAN Technology Concepts  WAN physical layer concepts for network and Internet communicationsITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  • Key WAN Technology Concepts •WAN physical-layer protocols describe how to provide electrical, mechanical, operational, and functional connections for WAN services. • The WAN physical layer also describes the interface between the DTE and the DCE.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  • Key WAN Technology Concepts  WAN data link layer protocols used in today’s Enterprise WAN networks Data link layer protocols define how data is encapsulated for transmission to remote sitesATM uses small and the mechanisms forfixed-size cells transferring the resultingof 53 bytes (48 frames.bytes for data), ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  • Key WAN Technology Concepts  Switching technologies used for WANs in an Enterprise setting Packet switching splits traffic data into packets that are routed over a shared network. Packet- A circuit-switched network is one that switching networks do not require a circuit to be establishes a dedicated circuit (or channel) established, and they allow many pairs of nodes to between nodes and terminals before the users communicate over the same channel. Packets are may communicate. divided and sent through available connections. PSTN and ISDN are two types of circuit- switching technology that may be used to There are two approaches to this link implement a WAN in an enterprise setting. determination, connectionless or connection- oriented.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  • Select the Appropriate WAN Technology to meet ECNM Requirements  List the various options for connecting subscribers to the WANITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  • Select the Appropriate WAN Technology to meet ECNM Requirements  Enterprises use leased line services to provide a WAN connection Point-to-point lines are usually leased from a carrier and are called leased lines.ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  • Select the Appropriate WAN Technology to meet ECNM Requirements  Circuit switching options available to provide a WAN connectionITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  • Select the Appropriate WAN Technology to meet ECNM Requirements  Packet switching options available to provide a WAN connectionITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  • Select the Appropriate WAN Technology to meet ECNM Requirements  List factors to consider when selecting a WAN connectionITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  • 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 –ATMITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  • 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 infrastructureITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  • ITE 1 Chapter 6 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21