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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.If you are satisfied, please adopt it.不能让楚国人活捉，所以只能选择死。年底之时，财富积累之下的苔湾更加壮盛，随着内陆各方起义者纷纷被压制，流民商贾不断涌入，西岸已开发大半，新立苔中、苔南、新竹三府，下属十余县，纳土著入籍，广垦良田，试种玉米、土豆等新作物。女性警視 vs 女性警察官この女たちの秘め事にあなたは驚愕する・・・W県内随一の高級中華料理店『玉好園』の特別個室で開かれる「県警本部の幹部たちの集い」、通称“円卓会議”。実質の最高意思決定機関として絶大なる権力を持つこの会議に極秘任務を担う一人の女性が呼び出された。それが監察官・松永菜穂子である。男尊女卑が色濃い旧態依然の県警の中で、女性警察官の道を作るために “円卓会議”のメンバーになろうと日々奮闘している。監察官である菜穂子の仕事は“警察の中の警察”ともいえるポジションであり、生まれ持った洞察力や観察力を駆使し、各所轄にいる女性警察官と対峙していく。しかしどの警察官も一筋縄ではいかない女性たちばかり。それでも菜穂子は“女性警察官の鑑”になるべく“円卓会議”のメンバー入りを目指し、清濁併せ呑み追及していくのだが、それぞれ何かしらの“秘め事”を抱えているようで―。菜穂子の正義とは？女性警察官たちが抱える驚愕の“秘め事”とは？W県警を舞台に繰り広げられる女の成り上がりストーリーである！干净舒适的街道，关心他人的人们…。In this case, the type given to it is NioDatagramChannel