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In situations where establishing a network infrastructure is impossible,Ad-hoc networks are considered particularly important. Most of the previousresearch in Ad-hoc networks concentrated on the development and enhancement ofdynamic routing protocols, which could efficiently discover routes between twocommunicating nodes. Although routing strategies is an important topic inMANETs, other topics such as data access are also crucial since the final goalof using Ad-hoc networks is to provide data access to mobile nodes. One of themost attractive techniques used to improve the data access performance in MANETenvironment is cooperative caching; which means multiple caching nodes shareand cooperatively manage the cached contents. It is lead the research toimportant questions, what data should be cached, where, when, and how? Acooperative caching addressed into two basic issues: cache discovery and cachemanagement, in other words, how to find requested data efficiently and how tomanage an individual cache to improve the overall capacity of a cooperatedcache. In this paper we have made a review of the existing cache discoveryalgorithms to address four stages after application request and before serverresponse, using an historical file to record the previous data requests, andproposed cluster architecture with data cluster head election to storeefficient information for future use and reducing the cost of flooding. Inaddition, this paper suggests some alternative techniques for cache discovery.Finally, the paper concludes with a discussion on future research directions.

Cache Discovery Policies of MANET