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The main reason why DDOS attacks are difficult to defend is that there are too many vulnerabilities and attack methods that can be exploited. In the OSI seven-layer network model used in the network data transmission process, basically each layer has protocols that can be exploited by DDOS attacks. According to the different network levels of the protocols used for DDOS attacks, this paper summarizes the currently known DDOS attack types and their defense measures as shown in Table 1-3. For more detailed information on current DDOS attack and defense, please refer to Huawei DDOS attack and defense summary post.先不急谢。According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.Originally, I played on the battlefield for a long time. Who hasn't smelled the blood? Who hasn't seen red brains, piles of intestines, broken arms and legs? Arguably, I should have adapted to this taste long ago. But that was different, It was blood, but it was very, very strong, so strong that those of us who used to smell it could not adapt to it. When I first smelled it, I was surprised. I felt that this smell was by no means emitted by human corpses. Later, I realized that this smell was emitted by the following something similar to the previous dog-like and non-dog-like things. " Zhao Mingkai paused here and probably wrinkled his nose instinctively, as if he had smelled the unforgettable and unpleasant smell of that year.3.2. 3 Turn off the event scheduler鬼倭，毫不怀疑自己，因为他们已经站在南京城下。