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The Internet's any-to-any, best-effort communication model is widely heralded as one of the main reasons for its success. The absence of strong architectural restrictions has allowed Internet protocols to support a tremendous variety of applications on the same network substrate. Yet these same "Architectural freedoms" have also emerged as ripe vulnerabilities for adversaries trying to exploit the network to their ends. For example, best-effort delivery and global addressing - both bullwarks of the modern Internet - are also the features that enable Distributed Denial-of-Service (DDoS) attacks to overwhelm remote sites on demand.
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