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Business Data Communications and Networking by Alan Dennis, Jerry FitzGerald

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Chapter 6. LOCAL AREA NETWORKS

LOCAL AREA NETWORKS

THE PRECEDING chapters provided a fundamental understanding of the five basic layers in a typical network. This chapter draws together these concepts to describe a basic LAN. We first summarize the major components of a LAN and then describe the two most commonly used LAN technologies: traditional Ethernet and switched Ethernet. The chapter ends with a discussion of how to design LANs and how to improve LAN performance. In this chapter, we focus only on the basics of LANs; the next chapter describes how LANs and BNs are used together.

OBJECTIVES

  • Be aware of the roles of LANs in organizations

  • Understand the major components of LANs

  • Understand traditional Ethernet LANs

  • Understand switched Ethernet LANs

  • Understand the best practice recommendations for LAN design

  • Be familiar with how to improve LAN performance

CHAPTER OUTLINE

INTRODUCTION

  • Why Use a LAN?

  • Dedicated-Server versus Peer-to-Peer LANs

LAN COMPONENTS

  • Network Interface Cards

  • Network Cables

  • Network Hubs and Switches

  • Network Operating Systems

TRADITIONAL ETHERNET (IEEE 802.3)

  • Topology

  • Media Access Control

  • Types of Ethernet

SWITCHED ETHERNET

  • Topology

  • Media Access Control

  • Performance Benefits

THE BEST PRACTICE LAN DESIGN

IMPROVING LAN PERFORMANCE

  • Improving Server Performance

  • Improving Circuit Capacity

  • Reducing Network Demand

IMPLICATIONS FOR MANAGEMENT

SUMMARY

INTRODUCTION

Most large organizations have numerous LANs connected by ...

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