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Vehicular Ad hoc Networks (VANETs) are the commercial version of Mobile Ad hoc Networks (MANETs) having very high mobility in which every vehicle acting as a host as well as router and forwards the packets to other vehicles. VANET forms decentralized networks, which enable plethora of important applications and services ranging from life safety applications to infotainment applications. High mobility in vehicular networks causes rapid topology changes and frequent disconnections. Due to this, data dissemination is a challenging task for researchers. Most of the data dissemination technique follows the iterative approach of Relay, Carry and Forward(RCF) in which road side units periodically pours the data packets to the moving vehicles, it buffers the data packet until a new vehicle enters into its vicinity and forwards the packet. This procedure establishes multi-hop communication to reach the destination. All these techniques have to consider about the delay and delivery ratio constraints with available bandwidth. The Performance of these techniques was highly affected by traffic density and data set size. In this paper, various data dissemination techniques and their performances, issues were analyzed thoroughly.

A Survey on RCF Based Data Dissemination Techniques for VANETs