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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.伯洲，给我抬出去，别在这扰我清静。? This mode is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while the multiple factory method mode provides multiple factory methods to create the object separately. Diagram:跟我们比，你经历的这些真的不算什么。约翰（艾伦·阿金 Alan Arkin 饰）是一名聋哑人，在小镇上的一间礼品店里工作，听觉和语言的缺失让他拥有更加敏锐的洞察力，也更加容易看透人和事的本质。约翰住在租来的房间里，这个房间原来的主人是一个名叫米克（桑德拉·洛克 Sondra Locke 饰）的女孩。　　新欢和旧爱，爱情和责任，四个步入中年的男女在一起，发生了一连串令人意想不到，却又在情理之中的故事，所有人都在婚姻中得到了成长。讲述了武阳市双华县楼门乡，以乡党委副书记席飞为代表的乡、县干部及记者全心全意为百姓办实事的故事。为了解决老百姓吃水难的问题，他们发动群众一起开发水窖，使每家每户都不再为吃水发愁；为了让村里富起来，他们和群众一起上山修路，开发温泉，办乡镇企业，招商引资。席飞等人因极力反对为了应付上级领导的视查而弄虚作假，与乡党委副书记、乡长白仲军等无视农民利益的另一部分人发生了分歧和矛盾，由此展开斗争，并最终取得胜利，维护了广大老百姓的利益，赢得老百姓的爱戴和拥护。