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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.9Episode 9//Written《密室大逃脱》是一档大型益智类实景解密互动真人秀。节目由嘉宾玩家倾力合作，进入不同主题故事置景内的“密室“演播室，全未知、不限时，每一期通过不同的角色扮演，与节目中的素人嘉宾进行益智力、创造力、决策力、洞察力、协作力和逆行力等多维度多元化的游戏对抗，最终解除重重困难，逃出节目组搭建的密室空间，传递出分工协作、合作共赢和永不放弃等正向价值。何况彭城还有怀王在，怕是有些不大方便。