A mobile ad hoc network is self-configured infrastructure where no of nodes interact with each other via multi-hop wireless links. Mobile nodes interact through a wireless medium without any centralized control, also nodes can move randomly. The basic strategies involved are reactive, proactive and hybrid. Unpredictable changes in the network topology are there due to the mobility of nodes which leads to the regular route change. Nodes involved in the MANET results in the frequent network topology changes which make the routing a challenging task. This paper involves the performance measures of AODV reactive protocol by calculating the metrics such as throughput, packet delivery ratio and delay under various nodes density condition in terms of QOS using OPNET MODELLER 14.5.