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Mobile Ad-hoc Network (MANET) are a new paradigm of wireless wearable devices enabling instantaneous person-to-person, person-to-machine or machine-to-person communications immediately and easily .In this paper an overview and history of MANET is given .The paper discusses the issues which should keep in mind for designing of MAC layer and Routing protocols at Network layer. All these issues can be taken into consideration for the improvement of MANET performance. In mobile ad hoc networks, several interesting and difficult problems arises due to shared nature of the wireless medium, limited transmission power, limited transmission range, node mobility, and battery limitations, bandwidth limitation etc. The limited transmission range of wireless network coupled with the highly dynamic routing infrastructure needs extra care.
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