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　　可怕的是有一条能把任何生物变成石头的恶龙肆虐，为了保卫原始时代的朋友们，喜羊羊他们携手挑战恶龙，懒羊羊更成为了足以改变历史的英雄人物……边境小城临江，阳光聋哑学校的校车向远山飞驰，校车上，校长张亚男用手语向孩子们讲述着沿途的风光，这时，孩子们惊慌的看着前方，一辆失控的帕萨特迎面驶来，校车左右躲闪，帕萨特冲出公路，撞上路边的山体，校车内，师生们面色铁青，张亚男急急下车，正这时，一辆灰色轿车，向这边疾驰。张亚男有种不详的预感，拉起王小萌急忙折返回校车，就在司机关闭车门的瞬间，一个男人手持散弹枪跳上校车，劫持了校车上的教师和学生，与警方对峙。至此，一场正义与邪恶的较量开始了……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.许朝光正狂妄之间，徽王府舰队拨出一艘大船独自出列转舵前来。***板栗问：皇上准奏了？你不是才换防回来吗？刘井儿好整以暇地回道：虎禁卫右将军可是个好缺，不知道多少人等着它空出来呢。她急忙结结巴巴道：陈大爷，我……我……我是来找小少爷的。For example, Xiao Hong recently saw a pair of shoes on Taobao. But after contacting the seller, Only to find out that these shoes were sold out, But Xiao Hong likes these shoes very much, So contact the seller and ask when the seller will have the goods. The seller told her that it will take a week to have the goods. The seller told Xiaohong that if you like, you can collect our store and inform you when the goods are available. Therefore, Xiaohong collected the store, but at the same time, Xiaoming and Xiaohua also liked the shoes and collected the store. They will be notified in turn when the goods arrive.