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An ad-hoc network is a collection of temporary nodes that are capable of dynamically forming a temporary network without the support of any centralized fixed infrastructure. These networks can be formed, merged or partitioned into separate networks on the fly, without necessarily relying on a fixed infrastructure to manage the operation. Two important properties of an ad-hoc network are that it is self-organized and adaptive. In a mobile ad hoc network (MANET) where security is a crucial issue, trust plays an important factor that could improve the number of successful data transmission process. The higher the numbers of nodes that trust each other in the network means the higher successful communication process rates could be expected. Since there is no central controller to determine the reliable & Secure communication paths in MANET, each node in the ad hoc network has to rely on each other in order to forward packets, thus highly cooperative nodes are required to ensure that the initiated data transmission process does not fail. In this paper, we provide a model & evidence through experiments on how a friendship concept could be used to minimize the number of false alarms raised in MANET Intrusion Detection System (IDS).