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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.唐朝代宗广德元年（763年），华佗的后人小大夫华星为救父亲华德之命，前往长安找父亲的故交伊太医索要救命中药。来到风凌镇，遭遇护送名斧“八卦宣花斧”前往京城送交皇帝的“刺客联盟”章楠一行和逃婚的伊莉，一同卷入绿林帮抢夺宝斧的风波:据说拥有宝斧，就能拥有权力和魔力，一统天下。与此同时，小镇出现了疑似瘟疫传染病，致使古镇沦陷，很多人成为疫毒者。华星寻找病因源头的同时，和伊莉、邵白、李梦蝶等人组成了团队，经历了各种生死离别以及搞笑逗乐的事件。简单概括为：小大夫和他的小伙伴们“英雄侠胆”打丧尸，“悬壶济世”救世人。这部真实的对话剧鲜明地刻画了每个人都会想到的、恋爱的人的丑陋。他们20年前因违反校规而关禁闭，结果死于意外的火灾。5个鬼魂多年来热和捣蛋，吓坏了老师和学生。在美丽女同事的请求下，奥德斯托决定正视眼前的一切，帮助这5个孩子超生……《天下财经》节目是北京电视台唯一一档证券类节目，一直以来，都是周一至周五证券市场交易时间播出，而每周末是金融市场、资本市场的总结时间，对于周末时段的财经节目，一直有着较强的观众需求，为此，《天下财经》在2007年增加周六的播出。009年11月天下财经推出：“天下财经·百姓炒股秀”节目。节目的宗旨是：“立足百姓，服务百姓”。节目推出一年多至今已有百余位普通股民走进了演播室，接连涌现出普通股民里的巴菲特、索罗斯、彼得·林奇们……他们用自己的语言，讲述老百姓自己的投资故事。他们虽然有着各自的财富神话和投资传奇，但是却有个共同的特点——他们都是普通的股民，都来自普通老百姓。