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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.The moment the finger is released from the screen.(2) At or near the stern of the ship and below the lights required in item (1) of this paragraph, a ring-illuminated white light.陈启把电视剧特效要达到什么效果，详细说了出来。就定下基调，带读者一起回味那些经典的小说。　　终于有一天，爱罗薇的研究有了新的突破，他们的工作站收到了一个以素数方式发送的奇怪信号，艾罗薇立即断定这是智能生命向空间发送的寻求伙伴的信号。清朝末年，城中百姓多数染上怪病。关心国家命运的禾苗希望张孝智助自己到水下地宫取得宝藏。但另有几方势力为了获得地宫宝藏展开了一场大乱斗。最终，众人发现所谓的宝藏根本子虚乌有。而导致盛京变成人间地狱的根源也非妖魔鬼怪，而是日本人人体试验的阴谋。 张孝智与禾苗、兄弟钱眼儿、弃暗投明的黑风双煞最终不计自身安危地准备解救盛京的危局……