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The major challenge to design and deployment of Mobile Ad hoc NETworks (MANETs) is its dynamic nature, which carries with itself a set of security measures to be resolved. In this paper, the authors compare the behavior of three routing protocols DSDV, DSR and AODV under security attack, where the investigation is carried out with respect to two types of node misbehavior. The parameters taken into consideration for evaluation of network performance are normalized throughput, routing overhead, normalized routing load and average packet delay, when a certain percentage of nodes misbehave. It could be established through simulation results that DSDV is the most robust routing protocol under security attacks as compared to the other two.
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