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.
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(1) Take the department as a unit, and hold a forum on the 8th floor every cycle. The company provides melon seeds, fruits and the like, and speaks freely and organizes the forum in a pleasant and harmonious atmosphere.
这地方是撑不住人的，必须用木梯。
这是一个关于沉沦和救赎的故事。三岁的女孩巧巧，可爱天真的巧巧触动了周慧心里那块残存的柔软之处，她把这个孩子收留了下来，让她和自己的儿子伟仔一块长大。巧巧的母亲何麦疯狂地寻找着自己的女儿，并精神失常。派出所的老刘救助了她，帮助她从一己的失子之疼中走出来。一个平凡而不幸的母亲焕发出博大的爱心，何麦在路口的家从此在窗台上亮起了小灯，为那些失去了孩子的父母和失去了父母的孩子提供力所能及的帮助……
于致远、赵佳妮结婚五年，3岁半的儿子于震轩周一至周五住在外婆家，夫妻二人只有双休日才把孩子接回家，享受短暂的亲子时光，他们是这个城市里司空见惯的“周末父母”。一次偶然的机会，赵佳妮意识到“父母是有有效期的”，为了能够参与儿子的成长，夫妻二人开始努力奋斗，争取早日结束这样的生活。在奋斗的过程中，于致远从一个愣头青记者成长为铮铮铁骨的当家主编，而赵佳妮也从一个碌碌无为的小女人晋升为独当一面的外企员工。在这个过程中，这对小夫妻面对高速发展的社会中的诱惑，一次次守住底线，向着目标前进。最终，他们坚守住时代的价值观，彼此不离不弃，终于明白陪伴才是对孩子最深的爱。
The first parameter is salary and the second parameter is grade.
小葱见闹得不堪，便对弟妹们道：这么玩有什么趣儿？不如我们把所有人分两拨，分别由大哥和你们姐夫领头，轮流派人下场对决——就是玩牌。
现在，网上对于张无忌最终到底会和谁在一起，吵得可谓不可开交。
天真无邪的少女清澄，为了给家人报仇，被训练成冷血杀手 ，数度杀人后，决定放下怨念，在安乐寨度过平静的后半生，在那里结 识了乐于助人的阿邦，并喜结连理，正当清澄隐藏武功，平淡过活的时候，无奈江湖风云又起，为了维护安乐寨的安宁，清澄再次挺身，成为 安乐寨的守护者。
品牌设计师春天（毛舜筠 饰）和女儿任秋水（吴千语 饰）在舅父Hugo（黄百鸣 饰）旗下的跨国内裤品牌企业内担任重职。一天，Hugo收到旧情人缪品（海清饰）从杭州寄来的礼物，顿生旧情复燃念头，不料却遭到谬品的出题刁难，希望Hugo设计一套以“男人如衣服”为主题的服饰。为了令计划顺利进行，Hugo花重金请来能力和手段同样厉害的Jojo（熊黛林 饰）来操刀“男人如衣服”系列，而此举也激起春天及女儿的强烈反对，母女二人只好联合T台万人迷owen（林峯 饰）加盟。就在局势刚刚扭转之际，阿费（郑中基）的突然出现，搅乱了原定计划，让一切又峰回路转……
User2. Work ();
Note: Only one layer can be established in this way. For recursive establishment,: os.makedirs ()
《巨虫列岛》是由パッショーネ负责制作的剧场版动画作品。
Guizhou Province
3. Apple's Apple II started the personal computer revolution in the 1970s, and the Macintosh relay continued to develop in the 1980s. Consumer software includes OS X and iOS operating systems, iTunes Multimedia Browser, Safari Web Browser, and iLife and iWork creative and production kits. Apple is famous for its innovation among high-tech enterprises in the world.
HBO宣布续订《副总统》第七季，将于2018年回归。
Second, in the middle and senior island round robin competition, you can get points for the competition by playing a certain number of games.
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