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Mobile ad hoc network is dynamic in nature and vulnerable for several attacks to be arising in it. Mobile nodes frequently disconnect and join the network; they can arbitrarily moves from one place to another. There are several attacks in MANET. One of the attacks is Black hole attack, it is a kind of active attack and it drops the entire incoming packet between one source and destination. Black Hole nodes or Black Holes actually send a fake RREP packet and advertise it as the shortest route is found. Sender starts transmitting packets to Black Hole, but packet does not reach the destination node on account of this attack and data packets are also lost.
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