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It is common that Internet service hosting centres use several logical pools to assign server resources to different applications, and that they try to achieve the highest total revenue by making efficient use of these resources. In this paper, multi-tiered enterprise systems are modelled as multi-class closed queueing networks, with each network station corresponding to each application tier. In...
In application-level DDoS attacks, attackers mimic legitimate client behavior by sending proper-looking requests via bots. The previous DDoS solutions focus on bandwidth flooding attacks, and have encountered significant difficulty in deployment. This paper presents a deployable architecture that counts the application-level DDoS attacks against Web servers by combining overlay and IP anycast. In...
This paper proposes a new Web QoS control strategy based on user behavior. Web QoS control strategy mainly include request classification, admission control, content adaptation technologies. The approach we take to Web QoS control first analyzes user access factors in request classification, admission control, and content self-adaptive strategies of Web QoS control mechanism, and then proposes user...
In modern web applications, several web sites often inhabit one single web server, asking for some software mechanisms to allocate server resources among those virtual hosts. This paper tries to study this issue from the perspective of control theory. First, solid proofs are shown to demonstrate that web servers could hardly be modeled with fixed parameters, which cast doubt on foundations of existing...
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