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A Mobile Adhoc Network Is A Network That Does Not Relay On Fixed Infrastructure .It Is A Collection Of Independent Mobile Nodes That Can Communicate To Each Other Via Radio Waves. These Networks Are Fully Distributed, And Can Work At Any Place Without The Help Of Any Fixed Infrastructure As Access Points Or Base Stations. As In Ad- Hoc Network Communication Medium Is Air So It Would Be Easy For Attacker To Fetch Information From Air Medium Using Sniffing Software Tool. There Is An Attack Which Causes So Much Destruction To A Network Called Sybil Attack. In The Sybil Attack A Single Node Presents Multiple Fake Identities To Other Nodes In The Network. In This Research, We Implemented The Sybil Attack Detection Technique Which Is Used To Detect The Sybil Nodes In The Network And Also Prevent It. Simulation Tool Used For The Implementation Is NS2.35.