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Information exchange in a network of mobile and wireless nodes without any infrastructure support such networks are called as Ad-hoc networks. A Mobile Ad hoc NETwork (MANET) is mobile, multi-hop, infrastructure less wireless network which is capable of autonomous operation. In this paper the authors have discussed some of the basic routing protocols in MANET like Destination Sequenced Distance Vector(DSDV), Dynamic Source Routing(DSR), Ad-hoc On Demand Distance Vector(AODV) and Zone Routing Protocol(ZRP). Security is one of the biggest issue in MANETs as they are infrastructure-less and autonomous. Therefore, in MANET networks with security needs, there must be two considerations kept in mind: one to make the routing protocol secure and second one to protect the data transmission.
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