With the progression of computer networks extending boundaries, Mobile ad hoc network (MOBILE ADHOC NETWORK) has emerged as a new frontier of technology to provide anywhere, anytime communication. Due to its deployment nature, MOBILE AD-HOC NETWORKs are more vulnerable to malicious attack. The absolute security in the mobile ad hoc network is very hard to achieve because of its fundamental characteristics, such as dynamic topology, open medium, limited power and limited bandwidth. The Prevention methods like authentication and cryptography techniques alone are not able to provide the security to these types of networks. Therefore, efficient intrusion detection must be deployed to facilitate the identification and isolation of attacks. In this paper we have surveyed various intrusion detection techniques in MOBILE AD-HOC NETWORK and analyzed their fruitfulness.

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