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Well, this article has already summarized how to add, delete and modify iptables rules. Combined with the previous article, we have mastered the "add, delete, change and check" of iptables rules. At the same time, this article has also summarized how to set the default strategy of the chain and how to save iptables rules.Category division is specified through the Coding Matrix. There are many forms of coding matrix, the common ones are binary code and ternary code. The former specifies each class as a positive class and an inverse class respectively, while the latter can specify "disabled class" in addition to the positive and inverse classes. FIG. 3.5 shows a schematic diagram. In FIG. 3.5 (a), classifier f2 takes samples of Cl and C3 as positive examples and samples of C2 and C4 as counterexamples. In FIG. 3.5 (B), classifier f4 takes the samples of C1 and C4 as positive examples and the samples of C3 as counterexamples. In the decoding stage, the prediction results of each classifier are combined to form the code of the test example. The code is compared with the corresponding codes of various types, and the category corresponding to the code with the smallest distance is taken as the prediction result. For example, in Figure 3.5 (a), if based on the European distance, the prediction result will be C3.The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.贾伊、拉瓦和库萨是三胞胎，但个性迥异。拉瓦是好心的放贷银行经理，库萨善良而狡猾，贾伊则是最危险的坏蛋。故事讲述了三兄弟的传奇……高级帮办奇精明干练，用卧底屡破黑社会集团，甚得上司赏识。奇结婚多年，生有一女，但妻子美欲摆脱婚姻枷锁，往台湾发展歌唱事业，与奇离婚。 　　奇专注工作，领导下属登、威、明及凤屡破奇案，直捣罪恶根源。 　　登单恋化验师华，但华对奇早已芳心暗许。奇几经风波，终于接受华的爱。登误会奇撬墙脚，大受打击，加上其妺少媚惨被诱奸，疑犯因证据不足而逍遥法外，登变得十分偏激，为了替妺复仇而加入黑社会。 　　奇不忍登误入歧途，力劝他回头，惜忠言逆耳，奇为着维护法纪，与登展开对峙……NBC宣布提前续订《芝加哥警署》第四季。“男人很痛苦”在现代大阪复苏！1969年8月，山田洋次导演、渥美清主演的电影《男人很痛苦》上映，大受欢迎。从那以后，寅次郎和妹妹樱的情爱，和眼皮上的母亲阿菊的郑重其事，和麦当娜的相遇和离别等固定的人情故事成为了日本盂兰盆节和正月不可缺少的风景诗。距电影第49作《寅次郎扶桑花特别篇》约四分之一世纪。2020年，舞台改成了大阪，寅先生以“伪作男很辛苦”的形象在现代复活。饰演寅的是关西的落语家桂雀等人。扮演寅次郎而备受瞩目的落语会“桂很痛苦”。由于其相貌相似，山田洋次导演亲自构思了新的寅先生像，《伪作男很痛苦》。饰演寅的妹妹小樱的常盘贵子和他的家人都会说大阪话。虽然把设定换成现代，提倡“伪作”，但“真品的赝品”是电视剧的一大看点。