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A mobile ad-hoc network contains nodes which are mobile and dynamic topology which changes with mobility of nodes and also with lake of centralization. This feature of mobile ad-hoc network comes with undefined and unsecure boundaries which makes security of network very challenging. Black hole attack is able to dump more than 90% of the users' information during route discovery process or causes network jamming. In this paper, the authors are proposed effect of black hole attack on mobile ad-hoc network and solution of minimizing effect of single or multiple black hole attack in mobile ad-hoc network.