A Dynamic wireless network which is composed without any actual infrastructure is a mobile ad-hoc network (MANET). Every potential node in the network deports as a router. These mobile networks are much more vulnerable than wired networks because of their restricted physical security, power constraints, network topology which keeps altering dynamically, and due to improper centralized administration. This paper portrays few attacks on each of OSI's network layer. It also confines some of the attacks faced by MANET. These attacks include packet drop, flooding, black hole, link spoofing, and wormhole. The intention of this paper is to survey the attacks on mobile ad-hoc networks and routing protocols. © 2006-2015 Asian Research Publishing Network (ARPN).