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The following are some small conjectures based on formulas:张一和张鑫本是建筑领域令人艳羡的佳偶，张一怀孕后张鑫主动提出辞职照顾家庭，到如今女儿笑笑已经五岁。从表面上看，事业稳步上升，家庭美满幸福，张一没有意识到，她已经处在被谎言包裹的漩涡之中……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.Title Category:Compared with the distributed denial of service attack that directly forges the source address, the reflection attack is more difficult to trace the source of the attack due to the addition of a reflection step. However, this is not the real threat of the reflection attack, and the real threat lies in the amplification attack using the reflection principle.