Effects of denial of service attack in WIFI-broadband networks.

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Akende, Yvonne Nalukui
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The University of Zambia
This Dissertation investigates the effect of Denial-of-Service (DoS) attacks in Broadband- Wi-Fi networks involving public sector networks. Over the recent past, Wireless communications have become increasingly popular in our everyday life and the world has become increasingly mobile. Traditional "wired" networks have proven inadequate to meet the challenges posed in this new era. As a result, wireless technologies have encroached on the realm of Traditional networks and has led to the widespread adoption of WLAN technology as a supplement to wired networking infrastructure in the enterprise office environment. The wireless communication revolution has brought fundamental changes to data networking and is making Wi-Fi Broadband networks a reality. Wi-Fi broadband networks provide several key benefits over wired or wireless networks only. However, this mix of wired and wireless networks poses a new class of attacks on wired networks via insecure wireless LANs. One such class of attack is the Denial of Service attack which constantly has threatened the availability of these networks. In this dissertation, we present our approach to study and review various security aspects of IEEE 802.11 based networks which is a set of standard for implementing WLAN. We further simulate and analyse using various network performance metrics the effects of DoS Attacks on Wi-Fi Broadband networks using OPNET Modeller. Results obtained from the simulation show that a network under DoS attack drops on average 10Mbps more packets at the access point, than one without this attack. Further, the end to end delay is 0.2s more on network under DoS than one without and that a network under DoS attack experience more queued packets than one without dos attack. The server response time also tends to be high as the number of malicious nodes increases. These results indicate that DoS attack has a serious effect of slowing down the upload and download time of resources and in even more important can cause drop in packets thereby denying services to users as well as threaten the integrity of data and availability of the much needed resources. Keywords: Wi-Fi Networks, Broadband Networks, DoS attacks, Wi-Fi Attacks, Access point
Master of Engineering in Information and Communications Technology Security in the School of Engineering
Network and Networking , Wi-Fi networks. , WiFi systems. , Broadband networks. , Network and networking.