Mobile Ad-Hoc Network (MANET) is a group of wireless mobile nodes connected to each other without any central administrator. Nodes can move from one place to another in the network or may leave or join the network at any time. Due to this the topology of the network changes rapidly. Due to the absence of central administrator the MANETs are vulnerable to attacks. In this paper, performance comparison of MANET in the presence and absence of two types of wormhole attack such as replay and

more »

... g has been carried out. The performance of the network is measured using metrics like Average End-to-End Delay, Throughput and Jitter by varying the number of nodes and number of attackers. The experimental results prove that the network performance is severely affected in the presence of wormhole attack.