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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.Chapter II Supervision InstitutionsAfter several days of experience, we have learned that many plants can be dyed, and pigments are already ubiquitous in plants. However, most plant pigments are easy to decompose and disappear. Only plant pigments that are durable and not easy to be oxidized can be used as dyes.Interpreter pattern, mediator pattern, visitor pattern, policy pattern, memo pattern, iterator pattern赵锋老鳖刘井儿等人都咬牙切齿，当即点齐了人手，分头奔向四城门。Eight, photo matching modeling (including sculpture, architectural modeling, etc.)故事发生在2003年的夏天，朵朵（杨子姗 饰）是刚刚踏出校园大门的应届毕业生，对未来充满了希冀和幻想。一次偶然中，朵朵和一个名叫贺言（郑恺 饰）的男人产生了矛盾，两人互不相让闹得不可开交。之后，朵朵在机缘巧合之下进入了贺言所在的公司工作，贺言成为了他的上司。