VANET is a rapid development of wireless communication technologies; give now the design of this technology in vehicles, in order to enhance intelligent transport systems by great advantages that could be derived from this technology with the objective of enhance the variability of traffic and improve RS (Road Safety), this kind of network gives communication between vehicles or between vehicles and roadside access points. In existing work, problem formulation defined security in VANET plays a vital role. VANET normally refers to a wireless network of mixed sensors or other computing devices that are deployed in vehicles. This type of network enables constant observing and sharing of road conditions and status of the transportation systems. AODV is the most normally used topology based routing procedure for VANET. Using of broadcast packets in the AODV route discovery phase caused it is tremendously susceptible against DoS and DDoS flooding attacks. In proposed work, a method using ontologies and vehicle data traffic management or information to ensure the data transmission of packets as soon as possible and in the most reliable way. Simulation tool used MATLAB 2016a to evaluate the performance metrics like as a packet delivery rate, throughput, End to End Delay and Overhead. In research work, proposed in B-AODV and PSOA algorithm, to improve the communication range, minimum overhead and packet delivery rate.

VANET (Vehicular Ad-Hoc Networks), B-AODV (Balanced Ad-Hoc On Demand Distance Vector), DDoS (Distributed Denial of Service) and PSOA (Particle Swarm Optimization Algorithm).

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