The aim of the thesis is to present the Wi-Fi protocol, its security standards and Denial of Service (DoS) attacks. A Wi-Fi network works wirelessly over radio waves, which means anyone can intercept sent packets and see their contents. For greater privacy and stability in Wi-Fi networks, various security standards have been included in the protocol. The WEP, WPA, WPA2 and WPA3 security standards are explained as part of the thesis. The theoretical part presents various types of attacks that can be carried out in wireless local networks. We set up a test environment using a TP-Link Archer C80 wireless router to set up a network using a mix of WPA2 and WPA3 standards. Several devices were connected to it. We demonstrated a deauthentication attack, a flooding attack, and a duplicate device simulation attack over the deployed network and devices. The deauthentication attack successfully disconnected older devices from the network. The flooding attack did not disconnect or weaken Wi-Fi connections. And the duplicate device simulation attack successfully prevented one device from accessing the internet, but did not disconnect it from the network. Finally, we suggest ways to defend against attacks and possible improvements of attacks.
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