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Mobile Ad hoc Network (Manet) is a collection of self-configuring nodes which move around and communicate with each other without the use of wires or any existing infrastructure. Such a dynamic topology, lack of a central network management point and limited resources serve as challenges to the network opening up possibilities for launching several attacks in order to exploit the vulnerabilities. In this paper, blackhole attack (the network layer attack), has been simulated in the mobile ad hoc network over AODV routing protocol, and the effect of the reliable transport layer protocol TCP has been analyzed over such a network. A variant of the same, TCP Vegas has also been analyzed for the effects of the attack on such a network. Performance has been measured using metrics of average throughput, normalized routing load and end to end delay and conclusions have been drawn based on that.