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Mobile ad-hoc networks (MANETS) are prone to a number of security threats. We incorporate our distributed reputation protocol within DSR and perform extensive simulations using a number of scenarios characterized by high node mobility, short pause time and highly sparse network in order to evaluate each of the design choices of our system. We focus on single and multiple black hole attacks but our design principles and results are applicable to a wider range of attacks such as gray hole, flooding attacks. Our implementation of black hole comprises active routing misbehavior and forwarding misbehavior. We design and build our prototype over DSR and test it in NS-2 in the presence of variable active black hole attacks in highly mobile and sparse networks.