*** DOS ATTACK ***
DOS attacks are the one of the most serious attack, protection against these kinds of attacks are too difficult. A denial of service attack (DOS) is when an attacker can make a system unusable or significantly slow for legitimate users by overloading the resources, so that no one can access it. If an attacker is unable to gain access to a machine, the attacker most probably will just crash the machine by using denial of service attack. Dos is an attack designed to render a computer or network incapable of providing normal services. The most common DoS attacks will target the computer's network bandwidth or connectivity. Bandwidth attacks flood the network with such a high volume of traffic, that's all available network resources are consumed and legitimate user requests cannot get through. Connectivity attacks flood a computer with such a high volume of connection requests, that all available operating system resources are consumed and the computer can no longer process legitimate user requests. Not all service outages, even those that result from malicious activity, are necessarily denial-of-service attacks. Other types of attack may include a denial of service as a component, but the denial of service may be part of a larger attack. Illegitimate use of resources may also result in denial of service. For example, an intruder may use of an anonymous ftp area as a place to store illegal copies of commercial software, consuming disk space and generating network traffic. A denial of service attack can also destroy programming and files in a computer system. Although usually intentional and malicious, a denial of service attack can sometimes happen accidentally. A denial of service attack is a type of security breach to a computer system that does not usually result in the theft of information or other security loss.
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