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Chapter V Supervision and Administration5 窨井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.In an interview with the parents of Jiang Yang's expected primary school students, the students of the practice team heard a completely different voice from the school: the teacher's qualification was low, the teaching was not responsible, the children were allowed to cheat in exams in order to achieve results, the school had potential safety hazards, and junior high schools were set up at random... All kinds of problems surfaced. What kind of education do the students receive? Did school really follow the tenet of "everything for children"? The players were very worried.1. Open the folder where the new project is located国会议员坎宁安和杰里米·杰克逊的新剧本喜剧《阿瓜驴子》已经在基比登陆，并将于今年春天上映。受同名短片的启发，《阿瓜驴子》将由Funny or Die和nd 3 Arts Entertainment制作。在这部永远是夏天的新剧里，MP (Cunningham饰)和Jer (Jackson饰)是一家叫Agua驴子的游泳池清洁公司的雇员。在他们的家乡犹他州，二人正在享受完美的晒黑、完美的氛围以及溴和氯的完美混合，为一些“最恶心”的后院游泳池服务。剧中还有婴儿达灵顿，他在剧中扮演他们的同事和恋人，还有卢克杰克逊，他在剧中扮演有名字的游泳池公司的老板。Understanding Enhanced Module Patterns