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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.When the applicant receives the first-level qualification certificate for maintenance and testing of fire-fighting facilities and fire safety assessment, he shall return the second-level qualification certificate to the original license issuing authority for cancellation.　Showtime在一月头预定新剧《芝加哥故事 The Chi》，由Lena Waithe、Elwood Reid、Common、Aaron Kaplan的Kapital Entertainment公司以及Fox 21 TV Studios联合制作；本剧去年就已拍摄试映集，但後来回炉重拍才被预订，该剧在美国时间18年1月7日首播。
　　本剧由Lena Waithe执笔﹑Rick Famuyiwa执导，讲述了芝加哥南区六个相互联系的人物所呈现的特色故事。角色包括Kevin（Alex R. Hibbert饰演），他是个能在恶劣环境生活﹑自信的13岁少年，原本他的生活很简单，就是痴心班上的一个女孩﹑在邻居之间有群朋友，以及希望某天离开南区。不过他有次在错误的时间出现在错误的地方，目击谋杀现场使他改变了对日常的看法。
　　Brandon（Jason Mitchell饰），一个有抱负有自信的年轻人，梦想着有一天能开一家自己的饭店，但是他对于新生活的承诺和对母亲以及在南区生活的弟弟的责任，似乎成为了这个梦想道路上的障碍。Jerrika（Tiffany Boone饰演），Brandon直言不讳的伴侣，她在努力让Brandon妈妈接受自己当儿子的女朋友，不过她为Brandon的选择是明智的。在当餐厅经理的她辛勤工作，就为了让Brandon离开街头幷成为一个大厨。
　　Emmett及Jada，全职护士兼单亲妈妈Jada（Yolonda Ross饰演），有着一个鲁莽但有魅力的儿子Emmett（Jacob Latimore饰）；Emmett原本是位女商人的伴侣，不过现在得独自抚养他那还在襁褓的孩子，至于Jada在对新成为父亲的Emmett采取严爱时，自己也探索起成年时的烦恼。
　　Ronnie（Ntare Guma Mbaho Mwine饰），前军人的他被芝加哥南区的生活拖垮，他平常经常与邻里的朋友打混，不然就是照顾自己祖母。不过某天她的前女友（Ronnie视她儿子如己出）驱使他为一宗谋杀案报仇时，Ronnie为了赢回前女友的心将会走上一条错误的路。Channel 4的5集剧《#男孩们# Boys》讲述80年代时三个男孩Ritchie（Olly Alexander饰）﹑Roscoe及Colin的故事，剧情长度将横跨10年。三名主角在18岁时离开家乡，带着希望﹑野心来到伦敦。然而当他们感染上爱滋病后（当年有发生血液污染案，造成大量人感染肝炎及爱滋病），这在当时仍然充斥着各种谣言的病使他们在别人眼中是威胁﹑恐怖的存在，不过主角们也因此团结起来。Charm 7: 8001-15000一个俄罗斯炸弹客在中国南海坠亡，20号分部的特工要去追回俄飞机上的赃物，并帮马来西亚警方对付三合会、调查印尼女商人的腐败，及深入缅甸三角区应对毒枭和军阀，化解威胁世界的危机。