Abstract
This chapter focuses on DoS (denial-of-service) attack. DoS requires two elements: a resource of finite capacity, and the means to acquire or “use up” the resource faster than it can be replenished. Generally, these attacks are thought of in terms of computers; DoS attacks do not have to be network-based. It is possible to have “real-world” DoS attacks. This chapter describes that DDoS (distributed denial-of-service) attacks can do significant harm. By recruiting many machines into a botnet and directing a flood of traffic against a victim, one can overwhelm the victim and degrade, deny, or in some cases even destroy the service. It explains what DoS and DDoS attacks are and how a DDoS attack is launched, as well as providing an understanding of why DDos attacks are so hard to defend against.
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