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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.Computer viruses, denial of service (DDS) attacks, and even physical damage to the power grid, the war strategy in the fifth area is still developing. Hacker crimes are common in banks, hospitals, retail stores and university campuses. However, if the central component of maintaining the normal operation of a society is destroyed by even the most "conventional" cyber crimes, you can only imagine how serious the damage will be caused after all the military forces of an enemy country launch attacks.Create multiple instances representing different users and call the above two methods for each instance.剑三十(潘志文)﹐一个不知真名的大侠﹐他的往事引来两个不知天高地厚的青年﹐一是富商独女梅大小姐(冼焕贞)﹐另一位是侠义心肠的砵仔(严秋华)﹐他们被剑十三的不羁而侠义的性格所吸引。此剧阐述此大侠及其崇拜者浪荡江湖的事迹。从揭穿柳青(伍卫国)假仁假义的真面目;平息两大帮会的纷争;破获五联镖局失镖案件;消灭以龙少爷(刘少君)为首的邪恶集团,却发现他的至爱拜月儿(叶玉卿)原来是罪魁祸首﹐终亲手杀死月儿;直至最后面对最可怕的对手燕南飞(尹天照)……上海某外企经理方圆与妻子童文洁产生了分歧。因为女儿朵朵成绩不佳，方圆力图送朵朵出国，而文洁因为父母在地震中去世的伤心事，十分重视家庭完整，反对女儿出国。夫妻俩为此事闹的不可开交。方圆的表姐林红棉与丈夫许光明也发生了情感危机——他们的孩子贝贝在国外留学，高昂的学费使这个家庭很难负担。许光明为了筹集学费，去了老情人、某公司女董事长陈宝珠手下工作，林红棉的家庭因此暗流汹涌。在方圆家做家教的单身妈妈吴佳妮也力图送女儿琴琴出国，经济拮据的她尝试将女儿过继给在美国的姐姐，遭到前夫金志明的反对，事情一筹莫展。最终，经过一系列风波，朵朵成绩突飞猛进，放弃了留学。许光明意识到自己对妻子的感情，放弃离婚与妻子修好。金志明为了女儿的未来，忍痛在过继协议上签字，但妻子吴佳妮却放弃了。这几个人在短短数月里，都经历了人生的别离，获得了感悟 。万婆子吓坏了，声嘶力竭地辩解。在整理父亲的遗物时，宁文源发现了一个放有书信、半块犀角佩、还有一幅双龙绘制图的秘藏匣子。在大家的努力下，双龙的秘密解开了。