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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.　　某日，一帮穷凶极恶的劫匪袭击的实验室，昆丁最好的朋友在交火中不幸丧生，这让昆丁感到十分悲痛，他发誓要替朋友报仇，并且拟定了一个危险的计划。实验室正在研究一种由蜘蛛血提炼而来的药物，昆丁偷到了这种药物，并且将它注入了自己的血液之中。可怕的事情发生了，昆丁并没有变成强壮的蜘蛛侠，而是渐渐的成为了毛茸茸的大蜘蛛。“第一次”是“无论多少次”——。一早起来，胜浩郁闷的发现自己还睡在这里，他决定自己找回丢失的溜冰鞋试图回去....In October, I went directly to JW in the district where the registered permanent residence was located to enroll in the college entrance examination. Tianjin's status as a student is not required for the Hongyin来势凶凶的女主，男主被整得很惨 温柔美丽的女孩总是别人眼中欺负的对象，讨厌的恶女三人组 校园剧必用的一招，英雄救美 恶女三人组遇见女主，没辙了 开始，女二是喜欢男主。　　光绪二十四年，戊戌变法失败，皇帝被囚，朝野上下一片混乱，不成气的刽子手孟小山巧遇江湖女儿柳青青，两人冤家路窄，却棒打不散，妓院春风楼内，大太监李莲英出宫密谋，不巧被孟柳二人撞上，李莲英暗藏鬼胎，收两人作心腹，冒充太监入宫，唯有任性妄为的多罗格格不知天高地厚，却又至情至性，孟小山精灵古怪，在各种关系中游刃有余，更令多罗格格由恨生爱，对其百依百顺，言听计从，被青青曾受护军统领唐啸天救命之恩，对其暗生情愫，得知唐啸天潜伏宫中准备营救皇上，决心冒死相助。孟小山财迷心窍，一心偷宝求财，无奈柳青青连求带逼，只得同意救驾，几个平凡的小人物一跃成为宫廷纷争的焦点，他们巧妙利用大总管，二总管及大格格之间复杂的关系，相互制约，开始进行救驾的计划，宫廷纷争风云变幻，几个屡历险境，躲过了一次又一次的杀身之祸。然而就在救驾计划最关键的时刻，孟小山和柳青青身份败露..