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Ad-hoc networks have opened a new dimension in wireless networks. It allows wireless nodes to communicate in absence of centralized support. It does not always follow any fixed infrastructure due to high mobility of nodes and multipath propagations. Routing protocols of mobile ad-hoc networks differ from the existing internet protocols which are designed for the fixed structure based wireless networks. The main classes of MANET routing protocols are Proactive, Reactive and Hybrid. In this paper, the authors compare performance of Hybrid routing protocol by focusing on Gathering-based Routing Protocol (GRP) and Reactive Routing Protocol by focusing on Temporally-Ordered Routing Algorithm (TORA) they use the OPNET to establish the simulation models of GRP and TORA protocols in MANET.
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