Chapter 1. Introduction

It is Monday night and you are still in the office, when you suddenly become aware of the whirring of the disks and network lights blinking on the Web server. It seems like your company’s Web site is quite well visited tonight, which is good because you are in e-business, selling products over the Internet, and more visits mean more earnings. You decide to check it out too, but the Web page will not load. Something is wrong.

A few minutes later, network operations confirm your worst fears. Your company’s Web site is under a denial-of-service attack. It is receiving so many requests for a Web page that it cannot serve them all—50 times your regular load. Just like you cannot access the Web site, none of your customers can ...

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