![]() On the way the IP datagrams have to pass a number of routers. The whole LAN network where the site is hosted is typically protected by a firewall system. The DoS tool which sends TCP packets with random settings to increase processing load on the victim machine is: Bubonic Which of these includes techniques to selectively drop incoming connections, in order to prevent a SYN flood attack. Todays web servers don't work as stand alone systems but need the support of a number of backend systems (like database- or file-servers) to fulfill their tasks. The clients access these servers via a load balancing server which redirects the HTTP requests to one of the servers. As you can see in figure 1 big web sites usually use more than one system running their web server. Figure 1 - Overview of attack scenario Before going more into details on DoS attacks we will first give an overview over the systems that are typically involved in DoS attacks.
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