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三更送上，明日还有三更，求表扬。It is a strong desire to change. I will print the embarrassing pictures I have encountered in my mind and spur myself. I will also put into my mind the attractive pictures of others on the stage, which is what I dream of. When you want to give up and be lazy, take out these pictures to inspire yourself.< div class= "three" > three　　《侏罗纪公园》。恐龙，恐龙，到处都是恐龙！天呐！网络世界里，真的没有俊男靓女了吗？贾丽投身于轰轰烈烈的网恋事业不能自拔。他，就是“孤独的手”……耿星光是村里的一个牛倌，是那种凡事喜欢一条道跑到黑的人。因为不满村长刘眼镜欺负自己的行为，萌生去大城市打工的念头。刚来到大城市四处碰壁，从建筑工地、饭店再到洗浴中心，干过许多不擅长的工作，出了不少笑话。但他善良、真诚、宽容，从不放弃努力，最终在洗浴中心找到了适合自己该片是一部以奥运为主题的高清数字电影，通过描写一个业余体校的普通武术教练吴杰（吴樾饰），辛勤培养自己的学生参加奥运会的故事，展示了一个小人物真实而又感人的内心世界，表现了几代武术运动员对中华武术的炽热情感以及对于武术走向奥运会的热烈盼望和艰辛努力。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.