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In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, What makes these packets special is that, The destination IP address points to the server, router, and other facilities that act as reflectors, while the source IP address is forged as the target IP address, When the reflector receives the data packet, it will think whether the data packet is requested by the attack target, so it will send the corresponding data to the attack target. When a large number of response data packets flock to the attack target, it will deplete the network broadband resources of the target, resulting in denial of service attacks.“金万德”从身份卑贱的妓女到朝鲜巨商的传奇人物。是捐献自己的全部财产来救恤深受旱灾的济州岛民众的历史人物，是以身作则实现“地位高则责任重（noblesse oblige）”理念的伟大女性。/impatient迈克等人在海特的帮助下，抓住了盖林多，并逃出圣多米尼哥。可海豹部队队员杰宁的尸体，被留在当地。迈克对此事念念不忘，一心想回去找弗里克报仇，而同时狱中的盖林多也设法通知弗里克，叫他设法营救。弗里克于是绑架了国家体操队的队员，用他们来交换盖林多。For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.随着科技的高速发展，意识沉浸式游戏《纪元》在全球大受欢迎，全意识接入的游戏体验和有自主思维的NPC让玩家仿佛置身一个“真实的玄幻世界”。 以游戏代练作为生计的施嘉杰和肖雷两人，意外的收到了《纪元》游戏的进入器。为了游戏中大赛的巨额奖金，施嘉杰决定进入游戏一试。殊不知，却卷入了莫名的追杀中，而这却只是拉开了这层层阴谋的序幕……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.