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我们先说正事。Crime and PunishmentSYN 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.Set the clock display size: Click Settings-Display and Brightness-Font Size-Select and drag the slider to select the font size. Then exit to see the size of the desktop clock font change.玛戈特出身于贵族家庭。她继承了一座城堡，和脾气暴躁的丈夫迪特前去视察。当他们抵达城堡，理智被逐渐侵蚀，两人的关系受到了考验。对家人感到失望的10岁女孩汉娜遇到父母长期在外工作的9岁的友美和7岁的友珍，三个小女孩互相依靠，重组小小的“家”，为了挽救彼此的家庭，她们决定开始一场未知的旅行。擅长描摹女孩细腻故事的韩国女导演允佳恩，继《我们的世界》之后的又一部佳作，用极富爱心的洞察力展现孩童之间复杂而微妙的情感，给成年人以别样的启示。