A Mobile Ad-hoc NETwork (MANET) is a collection of wireless mobile nodes which are capable of communicating with each other without the help of network infrastructure. MANETs possess unique characteristics of self-organizing and self – configuring. The important applications of ad-hoc networks are military operations, disaster management etc. Routing protocol plays a major role to prevent routing attacks. Security attacks can be launched towards any layer of the protocol stack. Routing in MANET is a challenging task because of its unique characteristics such as dynamic networking topology, limited band width and battery power etc.