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Growing number of vehicles in use has ushered in the service to provide human and resource safety. The present trend calls for the application of technology to automate safety measures in road traffic and since has been known as Intelligent Transport System (ITS). Vehicular Ad Hoc Networks (VANETs) are envisioned to be used in practical ITS systems around the world. Privacy and Security have become an indispensable matter of attention in the VANET Networks, which is vulnerable to many security threats these days. One of them is the Denial of Service (DoS) attacks, where a malicious node forges a large number of fake identities, ie, Internet Protocol (IP) addresses in order to disrupt the proper functioning of fair data transfer between two fast moving vehicles. In this paper various level of Denial of Service attack in VANET are discussed and various approaches that mitigate the impact of DOS, Jamming and Distributed DOS attacks are surveyed and a simple scheme is proposed to overcome DOS.