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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.Arawee（Jui饰） 和 Anthiga（Rita饰） 是同父异母的两姐妹，她们总是不断的竞争，互不相让，她们拿两兄弟的真爱来当赌注，Arawee 将利用这次机会来报复她的妹妹，因为她不相信真爱，Anthiga 则想方设法想...#Arawee（Jui饰） 和 Anthiga（Rita饰） 是同父异母的两姐妹，她们总是不断的竞争，互不相让，她们拿两兄弟的真爱来当赌注，Arawee 将利用这次机会来报复她的妹妹，因为她不相信真爱，Anthiga 则想方设法想要赢得她爱的男人的心，然而这场比赛却渐渐不受她们控制了...或许是因为夜晚的缘故，女刺客今日并不曾蒙面，尹旭也终于能意见她别致的姿容。In addition, they apply different stages of design, and the appearance mode is used in the early stage of design, because the system needs to rely on appearance in the early stage, while the adapter is applied after the design is completed. When it is found that the designed classes cannot work together, the adapter mode can be adopted. However, in many cases, the use of adapter mode should be considered at the early stage of design, such as involving a large number of third-party application interfaces. Proxy mode is that after the mode is completed, it wants to be provided to other clients in the form of services for calling. At this time, other clients can use proxy mode to access the module.　　本片为刘家班鼎盛时期的经典力作之一，由当时红极一时的“功夫小子”汪禹担纲主演，其顽皮活泼、精灵鬼马的表演令人拍案叫绝。唐伟成所饰的大反派也非常出彩。本片剧情幽默搞笑，武打精彩新颖，是一部难得的经典动作喜剧片，值得品味。"In such information exchange meetings, some large banks have adopted a very open communication attitude and actively shared with others the security threats they have encountered and practical and effective solutions. In this way, large banks have at least opened up communication channels," commented RichBolstridge, chief strategic expert in the financial services department of Akamai Technology Company.这天，庄谢把工作做完，悠哉悠哉的泡了一杯茶，翻开《武侠世界》，开始看《倚天》。