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Mobile Adhoc Networks (MANET's) are autonomous distributed systems that comprise a number of mobile nodes connected by wireless links, forming arbitrary time varying wireless network topologies. Security in mobile ad-hoc networks are particularly difficult to achieve, notably because of the limited physical protection to each of the nodes, the sporadic nature of connectivity, the absence of a certification authority, and the lack of a centralized monitoring or management unit, so it is not practically possible to prevent the network all the time. But Intrusion Detection System (IDS) can act as a frontier security area in relation to mobile ad hoc networks.
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