Wireless sensor network has been grown as hottest research area for past few years. They have extensive applications; there are various areas in wireless sensor networks on which researchers are working. The area which have gain attention of almost every researcher is security, security of wireless sensor network has become very important since once deployed these networks are unattended and unprotected. . As security playing very important role in it, to provide better security algorithms nature of attack should be known and the type of parameter on which it affects most should be considered. Sensor networks are vulnerable to various attacks like sink hole attacks, black hole attacks, wormhole attacks and selective forwarding attacks . in this paper we are going to concentrate on selective forwarding attacks . In selective forwarding attack, malicious nodes may refuse to forward certain messages and simply drop them, ensuring that they are not propagated any more. In this research paper we are going to analyze the selective forwarding attacks in wireless sensor networks on the basis of some parameters like network throughput, end to end delay and energy consumption, dropped packets by simulating it using OPNET MODELER 14. 5

Analysis selective forwarding attacks