Ad-hoc network is a kind of temporary network used to establish
connections for a temporary purpose. The ad hoc network is a kind of wireless
network. This is not an infrastructure-based network. Mobile ad-hoc networks and
Vehicular ad-hoc networks are two popular areas of ad-hoc networks. VANET is the
most popular network nowadays. VANET is the network on wheels i.e. Vehicle is
considered as a node; there is no issue of power management in this network, unlike
MANET networks. Further to increasing the efficiency at such high speed, various
issues and challenges occur in the path of this self-organized network. VANETs
present the largest real-time application but lack security, scalability, efficient routing,
and clustering protocols. The main aim of the study is to focus on various issues and
challenges related to security requirements in VANET, which will allow researchers to
work in this field for increasing the reliability of the network. Also, various attacks are
focused which show the threats in the vehicular networks because of their dynamic
topology.
Keywords: Intelligent Transport Network (ITN), MANET, VANET, V2I, V2V.
