These Mobile Adhoc Network (MANET) isself-managing and governing network with their uniqueinfrastructure less feature. There are many routing protocolshave been proposed for the needs for research in MANET .Theobjective of this paper is to analyze and compare the behavior ofthree most popular routing protocols i.e. Ad-hoc On-demandDistance Vector (AODV), Destination-Sequenced DistanceVector routing protocol (DSDV) and Dynamic Source Routing(DSR) using Network Simulator-ns-2 which is a discrete eventopen source simulator targeted at wired and wirelessnetworking research .Here evaluation based on performancemetrics such as packet-delivery-fraction (PDF) ,averageend-to-end delay of data packets and data packet loss bykeeping different pause time