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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.　　但是当Natee和Prin被房间的原主人Talae摆了一道的时候，两人的生活从此不再平静了。因为Talae在这其中做了一件很不厚道的事，他骗两人签了同一份合约，所以两人只能挤在With Love公寓一个小小的房间里。IBM's Price agrees.HBO将于北京时间2月6日开播全新动画喜剧#纽约屁民##Animals#！新剧借动物之名含沙射影地展现了纽约这座糟糕城市中屁民一代的生活，是一部披着动画外衣的讽刺喜剧！剧集2015年1月在圣丹斯电影节首映后获HBO两季续订，首季预计10集！HBO宣布续订《副总统》第七季，将于2018年回归。"I am from Beijing, Ancestors raised dogs for the imperial court, The dog was not the pet of the nobles, Even royalty racing dogs, One by one, They are very expensive, In terms of seniority, it is a matter for my great grandfather's generation to move forward. Therefore, the family has inherited dogs from generation to generation, I have also saved up a lot of ancient books and materials in this field, Some of them were found and burned in the period of breaking the Fourth Old Age. Also because this was criticized during the Cultural Revolution, But it doesn't matter, The key is that I can look at dogs. I have been growing up in this environment, so I have had special feelings for dogs since I was a child. You see, unless I have to use it, for example, now, otherwise I never say the word "dog" but only "dog", because this is a kind of respect for dogs. This is like describing that it is normal for people to talk about "a", that is, to talk about "only" or "bar", that is to swear.