Chapter 9. METROPOLITAN AND WIDE AREA NETWORKS

METROPOLITAN AND WIDE AREA NETWORKS

MOST ORGANIZATIONS do not build their own metropolitan or long-distance communication circuits, preferring instead to lease them from common carriers or to use the Internet. Therefore, this chapter focuses on the MAN/WAN architectures and telecommunications services offered by common carriers for use in MANs and WANs, not the underlying technology that the carriers use to provide them. We discuss the four principal types of MAN and WAN services that are available: circuit-switched services, dedicated-circuit services, packet-switched services, and virtual private network (VPN) services. We conclude by discussing how to improve MAN and WAN performance and how to select services to build MANs and WANs.

OBJECTIVES

  • Understand circuit-switched services and architectures

  • Understand dedicated-circuit services and architectures

  • Understand packet-switched services and architectures

  • Understand VPN services and architectures

  • Understand the best practice recommendations for MAN/WAN design

  • Be familiar with how to improve MAN and WAN performance

CHAPTER OUTLINE

INTRODUCTION

CIRCUIT-SWITCHED NETWORKS

  • Basic Architecture

  • Plain Old Telephone Service

  • ISDN

DEDICATED-CIRCUIT NETWORKS

  • Basic Architecture

  • T Carrier Services

  • Synchronous Optical Network

PACKET-SWITCHED NETWORKS

  • Basic Architecture

  • X.25

  • Asynchronous Transfer Mode

  • Frame Relay

  • Ethernet Services

VIRTUAL PRIVATE NETWORKS ...

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