Business Data Communications and Networking

Chapter 8. BACKBONE NETWORKS

THIS CHAPTER examines backbone networks (BNs) that are used to link LANs together and to link BNs to WANs. We begin with the various types of devices used in BNs and discuss several backbone architectures. We then turn to two technologies designed primarily for use in the BN (ATM and gigabit Ethernet). The chapter ends with a discussion of how to improve BN performance and of the future of BNs.

OBJECTIVES ▾

• Understand the internetworking devices used in BNs

• Understand several common backbone architectures

• Be familiar with gigabit Ethernet

• Understand the best practice recommendations for backbone design

• Be aware of ways to improve BN performance

CHAPTER OUTLINE ▾

INTRODUCTION

BACKBONE NETWORK COMPONENTS

• Switches

• Routers

• Gateways

• A Caution

BACKBONE NETWORK ARCHITECTURES

• Backbone Architecture Layers

• Switched Backbones

• Routed Backbones

• Virtual LANs

THE BEST PRACTICE BACKBONE DESIGN

IMPROVING BACKBONE PERFORMANCE

• Improving Computer and Device Performance

• Improving Circuit Capacity

• Reducing Network Demand

IMPLICATIONS FOR MANAGEMENT

SUMMARY

INTRODUCTION

Most business organizations realize that information must be stored, retrieved, analyzed, acted on, and shared with others at a moment's notice. Without an enterprisewide network or an Internet connection, moving information from one department LAN to another or to customers is difficult.

Interconnecting the organization's diverse networks ...