Complexity and severity of DDoS attacks is increasing day by day. The Internet has highly inconsistent structure in terms of resource distribution. Numerous technical solutions are present in this domain but solutions considering economic aspects have not been given attention. Distributed Denial of Service (DDoS) Attacks – Classification, Attacks, Challenges and Countermeasures provides an overview of both types of defensive solutions proposed so far, exploring different dimensions that could be considered to mitigate DDoS effectively and show the implications associated with it. This book covers topics that describe taxonomies of DDoS attacks in detail, recent trends and classification of defensive mechanisms on the basis of deployment location, types of defensive action and economic incentive-based solutions. It introduces chapters discussing various DDoS attack types associated with different layers of security, attacker’s motivations, importance of incentives and liabilities in any defensive solution. It illuminates the role of fair resource allocation schemes, separate payment mechanisms for attackers and legitimate users, negotiation models on cost and types of resources, risk assessments and transfer mechanisms. This book is designed for readers who have an interest in the cyber security domain, including students and researchers who are exploring different dimensions associated with the DDoS attack, developers and security professionals who are focusing on developing defensive schemes and applications for detecting or mitigating DDoS attacks and faculty members across different universities.