-The DoS attack started in the early 90s. First, they totally "primeval", including an attacker only exploits the maximum bandwidth from victims, prevent others being served. This is done primarily by using the simple methods like ping floods, SYN floods and UDP floods. After that, the attacks become more complex, by making fake victims, sent several messages to the other machine and machine flooding the victim with the reply message. (Smurf attack, IP spoofing, etc.).
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