14-02-2017, 11:35 AM
Wireless local area networks (WLANs) are becoming an increasingly important technology that is approaching the world. WLANs are used in every area, such as education, agriculture, pharmaceuticals, manufacturing, transportation, military, and research. Therefore, the importance of WLAN security is significant. There are two popular WLAN styles: client-server networks and ad-hoc networks. The difference between these two networks is that client-server networks use access points or routers to transmit data, but ad-hoc networks do not depend on any pre-existing transmitter. Instead, all nodes in an adhoc network participate in the routing process by sending messages to each other. According to the Institute of Electronic and Electronic Engineers (IEEE) 802.11g standards (IEEE Org., 2012), all wireless network nodes transmit packets of data in different channels. Since the channels in the WLANs are defined by the frequencies, they are susceptible to malicious interference attacks. It is easy for attackers to manage to send multitudes of useless packets on a specific frequency. Blocking attacks attempt to lock the system by flooding it with useless traffic and use all network resources so that users on the network can not connect to the system. It is constantly used by hackers to break down network systems due to ease and security issues. In this case, sis, clienterver and ad-hoc networks were simulated using the OPNET Modeler simulation tool (OPNET Technologies, Inc., 2012). During the simulation, factors that may influence the simulation result, such as distance, power level and protocols used in ad hoc networks were taken into account.
