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DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.讲述了出身豪门的女主人公用自己的方式向世人证明自己实力的故事。因为该剧打破了韩剧惯常的主人公从一贫如洗走向成功的老套剧情，不少观众都对该剧期待不已。《国家机密2》人物设置上仍以国安干警与境外间谍智斗为主线，情节更加起伏跌宕，悬念重重。同时，在对人物的刻画上，避免人物概念化，特别是对间谍分子的刻画。和前部《国家机密》相比，《国家机密2》在剧本、拍摄以及后期制作上，都将力求表现反间谍工作的专业性。剧中借鉴、汇集了一些国内外反间谍工作中一些先进甚至具有科技含量的侦察手段，加之器材与道具的考究、场景与细节的真实，再现国内外反间谍战线的惊险与刺激。Public class Memory {《以你为名的青春》剧中主要讲述五位男女主角，从校园青春的纯纯爱恋，到成年后关于梦想未来的情感纠结，横跨十几年的喜怒哀乐。Activity monitor is a device that can detect and interfere with traffic to the server. Like firewalls, it is not a necessary device in network routing. A typical monitor, like the ACK disguised firewall/proxy in 7, has an additional capability, that is, if it finds that the SYN packet originates from an attacker source address it knows, it will immediately send the disguised RST packet to the server. Activity monitors are practical because they are cheap and easy to deploy (compared with schemes based on firewalls and input source filtering), and can still protect the entire server network without requiring each server operating system to implement a terminal-based solution.　　无奈的楚留香只好着手调查，路上邂逅了一心替父报仇的苏蓉蓉，二人打打闹闹，闹出不少笑话，经过重重难关，留香意外地发现这件事居然跟挚交好友妙僧无花及丐帮帮主李红袖有关。