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Ad Hoc networks are susceptible to many attacks due to its unique characteristics such as open network architecture, stringent resource constraints, shared wireless medium and highly dynamic topology. The attacks can be of different types out of which denial of service is one of the most difficult attacks to detect and defend. Jellyfish is a new denial of service attack that exploits the end to end congestion control mechanism of TCP (Transmission Control Protocol) which has a very devastating effect on the throughput. The architecture for detection of such attack should be both distributed and cooperative to suit the needs of wireless ad-hoc networks that is every node in the wireless ad-hoc network should participate in the intrusion detection.
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