International Journal of Computer Science and Communication Networks (IJCSCN)
MANET is a wireless ad hoc network, decentralized network and autonomous system. Mobile ad hoc network is created by mobile nodes. To forward the packet, each node in MANET acts as router. That is free to moving in and out in the network. There are some constraints like limited resources, self - configuration ability, power consumption ratio and security. Among them security is the most challenging job in MANET to maintain the networks performance. There are different types of attacks detected in MANET. Denial-of-Service (DoS) attacks are detected on network layer which are namely as gray hole attack, black hole attack and worm hole attack.