A MANET is an autonomous collection of mobile users that communicate over relatively bandwidth constrained wireless links. Since the nodes are mobile, the network topology may change rapidly and unpredictably over time. The network is decentralized; where all network activity including discovering the topology and delivering messages must be executed by the nodes themselves. The verification of node locations is an important issue in mobile networks, and it becomes particularly challenging in the presence of adversaries aiming at harming the system. In order to find the neighbour nodes and verify them various techniques are proposed.