Preface

With the explosion of the Internet, computers have become ubiquitous, and the networks to connect them have become as pervasive and as critical as a telephone connection. Many businesses depend on their networks to conduct their day-to-day operations, to offer their services, and often to sell their products. Further, as a result of the global reach of the Internet, crossing language and geographic barriers, businesses need to be open to serve one part of the world while the other part sleeps. Consequently, it has become critical for networks to be up and available 24 hours a day, seven days a week, to serve a global customer base.

Network failures result in losses of hundreds of millions of dollars to businesses each year. These network ...

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