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There is a critical need for a common evaluation methodology for distributed denial-of-service (DDoS) defenses, to enable their independent evaluation and comparison. We describe our work on developing this methodology, which consists of: (i) a benchmark suite defining the elements necessary to recreate DDoS attack scenarios in a testbed setting, (ii) a set(More)
Many network services such as voice, video, and collaborative applications require an informed view of network characteristics for effective operation. Sharing a network measurement service across multiple applications can significantly reduce measurement overhead, and remove the burden of performing network measurements from individual applications. To be(More)
Simulation, emulation, and wide-area testbeds exhibit different strengths and weaknesses with respect to fidelity, scalability, and manageability. Fidelity is a key concern since simulation or emulation inaccuracies can lead to a dramatic and qualitative impact on the results. For example, high-bandwidth denial of service attack floods of the same rates(More)
We study the sleep/wake scheduling problem in the context of clustered sensor networks. We conclude that the design of any sleep/wake scheduling algorithm must take into account the impact of the synchronization error. Our work includes two parts. In the first part, we show that there is an inherent tradeoff between energy consumption and message delivery(More)
A major challenge that researchers face in studying denial of service (DoS) attacks is the size of the network to be investigated. A typical DoS attack usually takes place over a large portion of the Internet and involves a considerable number of hosts. This can be intractable for testbed experimentation, and even simulation. Therefore, it is important to(More)
Network monitoring capabilities are critical for both network operators and networked applications. In the context of an experimental test facility, network measurement is important for researchers experimenting with new network architectures and applications, as well as operators of the test facility itself. The Global Environment for Network Innovations(More)
The use of wireless sensor networks has grown tremendously in the last decade, wireless sensor networks are used in wide variety of applications. Nodes in WSN have limited battery lifetime that affects the performance of the network. Scalability is also a major concern. The use of clustering in WSN provides a solution to this. Many improvements have been(More)
Das, Saumitra M. Ph.D., Purdue University, December, 2007. A Multi-Layer Ap­ proach Towards High-Performance Wireless Mesh Networks. Major Professor: Y.Charlie Hu. Wireless mesh networks are characterized by static mesh routers connected by wireless links to each other providing Internet connectivity via multi-hop access to sparsely deployed gateways. Such(More)
There are several application have been developed with need of self organization for network. To fulfill this requirement need of wireless sensor network in such applications. To manage network efficiently clustering is used. Lots of works have been done in field of wireless sensor networks (WSNs) in last few years. These researches have boost potential of(More)
Energy Management can be improved by proficient clustering algorithms in heterogeneous wireless sensor networks. Coordination through cluster head selection provides efficient data aggregation that reduces communication overhead in the network. In this paper, we propose a fuzzy logic approach based DDEEC clustering algorithm which aims to prolong the(More)