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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.大太太这次坚决支持儿子，将内院所有丫鬟婆子归拢，一个也不准走动。2. Thrombolytic therapy for thromboembolic diseases is one of the common diseases endangering health. Thrombolytic therapy is the most effective treatment. Thrombolytic drugs are applied to the formed thrombus. Fibrinolytic activator is used to convert plasminogen into fibrinolytic enzyme, so that thrombus can be dissolved in time, local blood circulation can be restored, and the function of tissues and organs affected by thrombus can be improved. A large number of data show that only 30% can autolyze after thrombosis, and about 50% can persist and no longer develop. Therefore, thrombolytic therapy in thromboembolic diseases, the earlier the treatment, the better the curative effect, especially the early recovery of important organs related to life, such as brain, heart and kidney functions, has more significant clinical significance.大唐王朝为巩固边防，颁令陇右节度使霍正威修建玉门关。威好大喜功，误信妖言，以童男童女为奠基供品，被“天下第一巧匠”洪天佑（罗家瑛）知悉。威恐佑泄秘，不惜诬告佑。佑被叛极刑，佑妻（汪明荃）跳城楼殉夫而死，遗下一对小儿女逸飞（关礼杰）及月影，幸得额吉救出，授以武功。女主说：没人想看男人的老二。显然这是不对的。美队当年爆出来私照我真是全网找。Learning design patterns does have several realms:侯府嫡女于妧妧从小遭遇十几次暗杀，靠装疯卖傻才活到现在，却在离家出走时被良人司季良月救下。司季良月答应保护于妧妧在府中安全，而于妧妧需要帮助司季良月在侯府中找出当年导致司季良月残废三年的毒药。有了司季良月撑腰，于妧妧成功逆袭，司季良月更是化身护妻狂魔，处处维护自己心爱的女孩。