MANETs have unique characteristics like wireless radio medium, dynamic configuration, fixed resources and deficiency of centralized administration; as a result, they are susceptible to many types of attacks in various layers of protocol stack. In MANET, each mobile node is able of behaving as a router. The requirement for a protected MANET networks is strongly attached to the security and privacy features. These jamming attacks are one of them. These attacks happen by transmitting uninterrupted radio waves to put down the transmission between receiver and sender.