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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.否则他西北角的魏军的阵地怎么就在瞬间被突破了，当真是可疑啊，现在没有时间的去追查这些事情，等将来查清楚之后一定要报仇。现实世界中的外科医生吴妍珠（韩孝周 饰）听说了身为著名漫画家的父亲失踪的消息，于是赶到父亲的工作室寻找线索，偶然地进入了人气漫画《W》的世界。2016年的首尔，相同的空间、不同的次元，与漫画男主人公姜哲（李钟硕 饰 ）在现实与虚幻中交错展开的悬疑浪漫爱情故事。斯洛博恩岛第一季……Launch attack is also called DRDoS (Distributed Reflective Denial of Service) attack, which refers to a distributed denial of service attack technology that uses routers, servers and other facilities to respond to requests, thus reflecting attack traffic and hiding attack sources.The second season of "Charming China City" has been upgraded completely, "Charming China City? The establishment of the" City Alliance "and the official launch of the" Charming Card "program mean that there is a broad prospect for the deep integration of culture and tourism, and the sustainable development of the city will also usher in a new breakthrough. CCTV's combination of boxing to help the poor through tourism shows the sense of responsibility and mission of the national big station.In addition, 10,000 hours is not a promise that can be fulfilled. Some people misunderstand that one can definitely become a master after "10,000 hours". This is a misunderstanding. The real meaning is that all masters and masters must go through a long period of training and will not master XXX in 21 or 30 days. This is the difference between a necessary condition and a sufficient condition.