Abstract
MANETs (Mobile Ad hoc Networks) had become the most important next generation wireless network technologies. It is made up of self-configurable mobile nodes, Intruders mieght decrease MANET functionality due to the dispersed and wireless nature of MANETs, and therefore they were vulnerable to numerous attacks at different levels. The important challenges for MANET were the security and routing protocols. This paper examined the impact of Jammer which it was a kind of DoS attack which interfere with the normal operation of network and show how the Jammer increased the delay and data dropped and decreased the throughput which they were the important parameters for the measurements of network performance. This performance could be improved using routing protocols (AODV, DSR, OLSR and GRP). Riverbed Modeler Academic Edition (17.5) was utilized for this study in number of modeled scenarios for video applications. The results address the impact of Jammers and show that the MANET's Routing Protocols could improve the throughput and data dropped of the network but on the expense of increasing the delay.
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