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"Do you mean it has' blades' on both sides of its teeth?" I said.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.　　《警察遇到兵》这部戏主要分为三个单元，整个剧情不仅有着案件悬疑的精彩剧情，同时也有很多让人觉得温情感人的部分，孙逊饰演的“罗三拐”和秦海璐饰演的“罗妻”，两人都是非常善良并且极具同情心的人物，两人养育的四个孩子中，有两个孩子并非是自己亲身的，令原本就不富裕的两人负担变的更重，但是两人都没有放弃， “罗三拐”（孙逊饰）为此也更加努力，并且将自己也改造成为新中国合格的人民警察。　　而一直深爱着颂莲的顾三在家人的安排下与陈忆惠结婚，但在他的心底依然勾画着颂莲的倩影，忆惠面对这样的婚姻并不气馁，凭着对顾三无限的爱，终于使他重拾昔日旧情，两人重归于好。陈飞浦更在抗战的战场上碰到志同道合的领弟，经过一番磨练，两人终结为秦晋之好！然而各自成家立业的飞浦和顾三仍不忘照顾颂莲，两家人将她带到上海，让她开始新的生活……十八组都亮相后，休息一个时辰，杨长帆等人入府商议，下午再做复选。门匾位置先空着，回头有御赐匾额下来。