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A mobile ad hoc network (MANET) represents system of wireless mobile nodes that can self-organize freely and dynamically into arbitrary and temporary network topology. Routing is the task of directing data packets from a source node to a given destination. The performance of MANET is evaluated by simulation methodology. This paper is subjected to comprehensive analysis among AODV, DSDV, DSR routing protocols of ad-hoc network with IEEE 802.11 Mac protocol in grid topology using Network Simulator-2(NS-2). Various important performance metrics of MANET such as Received Packet Vs. no. of nodes, Packet delivery ratio Vs. no. of nodes, Total dropped packets Vs. no. of nodes, Average end to end delay Vs. no. of nodes are investigated to confirm the best routing protocol in the simulation environment.