A mobile Ad hoc network is an autonomous system of mobile hosts connected by wireless links without an infrastructure. Such networks are useful in military and other tactical applications, e.g. army's quick spread in the battlefield, emergency rescue or discount wedding prom dresses exploration missions after earthquake or flood, where cellular infrastructure is unavailable or unusable. In an Ad hoc network, each mobile node operates not only as a host but also as a router. Ad hoc networks have a series of advantages, for instance, they can be built rapidly and easily wedding dresses form china and they are not restrained by wired networks and so on. Therefore, Ad hoc networks surely have a bright future.Because of constantly changing topology, Ad hoc networks cannot just adopt traditional routing protocols which do well in wired networks. Researches of developing new routing protocols for cheap nike shoes Ad hoc networks become the most important part of the Ad hoc network study.In this paper,the actuality and prospect of Ad hoc networks are summarized in chapter one, including the wedding dresses 2nd definition, architecture, characteristics, application fields and critical technologies of Ad hoc networks. In chapter two, the classification of routing protocols of Ad hoc networks are introduced. Two important routing protocols (hot women's dresses and DSR)are briefly introduced and compared. In the third chapter,we compared the performance of three on-demand routing protocols(AODV,DSR and TORA) under three scenarios.
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