The rapid growth of mobile computing technology and wireless communication has significantly increased the mobile users worldwide. This fact is the reason for the new applications of mobile ad-hoc network and providing reliable communication services to the users. Due to resource scarcity and dynamic network topology, providing reliable service is difficult. This paper is to explore ad-hoc routing issues in MANET. Routing protocols are vulnerable to routing attacks like packet dropping and delayed packet forwarding. Their proposed scheme considers malicious behavior of nodes which causes significant degradation in network performance. To improve the network performance, their scheme includes trust model based on different statistical parameters with their weightage.