Atul D.Atalkar et al, International Journal of Computer Science and Mobile Computing, Vol.3 Issue.10, October- 2014, pg. 219-224 © 2014, IJCSMC All Rights Reserved 219 Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320–088X IJCSMC, Vol. 3, Issue. 10, October 2014, pg.219 – 224 REVIEW ARTICLE Study of Flat - Reactive On-Demand Routing Protocol (DSR & AODV): A Review Atul D.Atalkar Second Year(III rd SEM), M.E (EXTC), ARMIET, Sapgaon,Thane.Dist.,M.H. atul_atalkar@rediffmail.com Prof. Prashant S.Wankhede M.E (ELEX), DMCE, Airoli, Navi Mumbai. Dist. M.H prashant6929@gmail.com Abstract — Mobile Ad-Hoc Network is a collection of mobile node, which communicates with each other to share information among them. Each node acts as a router itself. They are freely to move and change their position within a network and arrange themselves share all resources with each other. But to share information a routing protocol is needed. Routing protocol plays an important role in network design and provides the simplicity, decision rights to network, which will increase the performance of network in various aspects. Like packet delivery ratio, packet delay, throughput, best route path, etc. Keywords- MANET, DSR, AODV, PDF __________________________________________________*****_________________________________________________ I. INTRODUCTION Mobile ad-hoc network is collection of mobile nodes, each mobile terminal is an autonomous node, which may function as both a host and a router. In other, since there is no background network words, besides the basic processing ability as a host, the mobile nodes can also perform switching functions as a router. So usually endpoints and switches are indistinguishable in MANET. For the central control of the network operations, the control and management of the network is distributed among the terminals. The nodes involved in a MANET should collaborate amongst themselves and each node acts as a relay as needed, to implement functions e.g. security and routing. Basic types of ad hoc routing algorithms can be single-hop and multi-hop, based on different link layer attributes and routing protocols. Single-hop MANET is simpler than multi-hop in terms of structure and implementation, with the cost of lesser functionality and applicability. When delivering data packets from a source to its destination out of the direct wireless transmission range, the packets should be forwarded via one or more intermediate nodes. In most cases, the MANET nodes are mobile devices with less CPU processing capability, small memory size, and low power storage. Such devices need optimized algorithms and mechanisms that implement the computing and communicating functions. MANETs are new paradigm of networks, offering unrestricted mobility without any underlying infrastructure. Basically, ad hoc network is a collection of nodes communicating with each other by forming a multi-hop network. A. Characteristics of a MANET: Nodes are free to move arbitrarily. The network topology may change randomly and have no restriction on their distance from other nodes. As a result of this random movement, the whole topology is changing in an unpredictable manner, which in turn gives rise to both directional as well as unidirectional links between the nodes Almost all the nodes in an ad hoc network rely on batteries or other exhaustive means for their energy. The battery depletes due to extra work performed by the node in order to survive the network. Therefore, energy conservation is an important design optimization criterion.