Mobile ad-hoc network is an infrastructure less and self-organizing concept of network organization. Due to the ad-hoc nature of network there are various security issues arises in the network. These security issues decreases the network performance in terms of battery power consumption, throughput and other performance parameters. The security of network resources is breaches by the malicious nodes which may either internal or external. Malicious node influence network working via putting the several of kinds of attacks. Certain number of protocols and methods are advised to prevent network from malicious nodes.