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In coming future, Mobile Ad Hoc Network (MANET) is going to lead the world in Wireless Technology. MANET consists of group of communication devices or nodes. These nodes desire to communicate without the help of any fixed arrangement and predefined association/structure of available links. In a MANET if mobile node keeps on increasing and moving simultaneously then it will attract the intruders in a form of malicious nodes, This is the biggest security challenge in any Mobile Ad Hoc network. Black Hole attack is one of them, here in this paper we are discussing about this threat and the security concern to overcome this problem with the help of routing protocol used in MANET.
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