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Mobile Ad-hoc NETworks (MANETs) is an infrastructure-less, dynamic network consisting of a collection of wireless mobile nodes that communicate with each other without the use of any centralized authority. Due to its fundamental characteristics, such as wireless medium, dynamic topology, distributed cooperation, MANETs is vulnerable to various kinds of security attacks like worm hole, black hole, rushing attack etc. In this paper, the authors study Mobile Ad-hoc NETwork and its characteristics, challenges, application, security goals and different type's security attacks at different layers.
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