Mobile Ad-hoc Network (MANET) is a rapidly changing network having collection of mobile nodes. The connection links between pair nodes are not certain because the nature of changing topology and infrastructure less in MANETs and Thereby there are various issues and restrictions which influence the performance of the network like mobility, overhead, battery drainage, delay and interference.; so MANET is subjected to recurrent link failures that will lead the network to route failure. It is in demand for the routing protocols to decide routes imperishable connectivity supplying persistent data transition without compromising quality of service and load balancing. All the routing protocols are utilized to manage the process of routing through the connection of nodes in the Mobile Ad-Hoc Network. Reactive routing protocols are used, when the source needs to send a packet to destination so the process of searching route will initialize, till it discovers the optimal path. The reactive routing protocols flood in the network for discovering the route of destination and they are not perfect in the term of bandwidth, but the reactive protocols are scalable in the change of network topology. Ad-hoc on-demand distance vector (AODV) and Dynamic routing Protocol (DSR) are reactive routing protocols which predominantly utilized in MANET for making routing resolutions because of their performance in terms of throughput, packet delivery ratio, delay, and number of hops when compared to other protocols, but AODV is shown better performance because it often concentrates to less reliable routes leading to high control overhead and packet loss. In this paper we discuss a general review of modified reactive routing protocol based on optimization algorithms for mobile Ad hoc networks.

MANET, Reactive routing protocols, Optimization techniques

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