Computation is spanning from PC to Mobile devices. The Mobile Ad hoc Networks (MANETs) are\noptimal choice to accommodate this growing trend but there is a problem, security is the core issue.\nMANETs rely on wireless links for communication. Wireless networks are considered more\nexposed to security attacks as compared to wired networks, especially; MANETs are the soft target\ndue to vulnerable in nature. Lack of infrastructure, open peer to peer connectivity, shared wireless\nmedium, dynamic topology and scalability are the key characteristics of MANETs which make\nthem ideal for security attacks. In this paper, we shall discuss in detail, what does security mean,\nwhy MANETs are more susceptible to security attacks than wired networks, taxonomy of network\nattacks and layer wise analysis of network attacks. Finally, we shall propose solutions to meet the\nsecurity challenges, according to our framed security criteria.
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