Designing Large Scale Lans

Most of the documentation on local area networks (LANs) is written for use with a specific vendor, but large scale LAN designs often use networking products from many different vendors. This book shows how to create the architecture for networks encompassing groups of large companies with multiple vendors. Designing Large Scale LANs shows network administrators how to determine network specifications based on business requirements (a practice known as "top-down design"), and then explores philosophically and technically how to design a network that meets those specifications. This book details the skills required to become a network architect, which in many organisations is the most senior networking position.

Kevin Dooley is an independent networking consultant who has been designing and implementing networks for more than ten years. In that time he has built large scale Local and Wide Area Networks for several of Canada's largest companies. He holds a PhD in physics from the University of Toronto and is the author of Designing Large-Scale LANs.

Preface

vii

Networking Objectives

1

(13)

Business Requirements

1

(4)

OSI Protocol Stack Model

5

(5)

Routing Versus Bridging

10

(2)

Top-Down Design Philosophy

12

(2)

Elements of Reliability

14

(36)

Defining Reliability

14

(3)

Redundancy

17

(27)

Failure Modes

44

(6)

Design Types

50

(76)

Basic Topologies

50

(11)

Reliability Mechanisms

61

(5)

VLANs

66

(4)

Toward Larger Topologies

70

(11)

Hierarchical Design

81

(32)

Implementing Reliability

113

(2)

Large-Scale LAN Topologies

115

(11)

Local Area Network Technologies

126

(43)

Selecting Appropriate LAN Technology

126

(4)

Ethernet and Fast Ethernet

130

(11)

Token Ring

141

(5)

Gigabit and 10 Gigabit Ethernet

146

(3)

ATM

149

(5)

FDDI

154

(1)

Wireless

155

(5)

Firewalls and Gateways

160

(2)

Structured Cabling

162

(7)

IP

169

(24)

IP-Addressing Basics

170

(3)

IP-Address Classes

173

(2)

ARP and ICMP

175

(2)

Network Address Translation

177

(2)

Multiple Subnet Broadcast

179

(3)

General IP Design Strategies

182

(9)

DNS and DHCP

191

(2)

IP Dynamic Routing

193

(41)

Static Routing

194

(2)

Types of Dynamic Routing Protocols

196

(1)

RIP

197

(9)

IGRP and EIGRP

206

(7)

OSPF

213

(15)

BGP

228

(6)

IPX

234

(13)

Dynamic Routing

236

(6)

General IPX Design Strategies

242

(5)

Elements of Efficiency

247

(26)

Using Equipment Features Effectively

248

(1)

Hop Counts

249

(1)

MTU Throughout the Network

250

(2)

Bottlenecks and Congestion

252

(1)

Filtering

253

(1)

Quality of Service and Traffic Shaping

254

(19)

Network Management

273

(33)

Network-Management Components

273

(2)

Designing a Manageable Network

275

(5)

SNMP

280

(8)

Management Problems

288

(18)

Special Topics

306

(35)

IP Multicast Networks

306

(13)

Ipv6

319

(14)

Security

333

(8)

Appendix: Combining Probabilities

341

(3)

Glossary

344

(20)

Bibliography

364

(5)

Index

369

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Designing Large Scale Lans

Summary

Author Biography

Table of Contents

Supplemental Materials