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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.该剧讲述名门音乐学院的学生们和他们周围的人们的故事。从三、四岁起就接受专业练习、演奏、参加音乐会的学生，以及对这些孩子们付诸才能、支持、爱、关注、执着的家长和老师的故事。 金旻载剧中饰演钢琴师朴俊英，他在国内数一数二的钢琴比赛获胜后，在各种国际比赛上数次夺冠。他的家庭是和古典音乐无缘的“司机食堂”，他6岁开始对钢琴觉醒，接受文化财团长年的后援，走上艺术中学-艺术高中-音乐大学的精英路线。 朴恩斌饰演音乐学院器乐系小提琴专业大四学生蔡松儿。她从管理系毕业后，挑战了4次才考入同一所大学的音乐学院，因此比同学们大7岁。是一个因为毕业后的就职问题和单相思而烦恼着的29岁的女生。 由独幕剧《17岁的条件》赵英民导演、柳宝利编剧再次合作的作品。　　在逆境中求生存的全，有志难伸的行，及善良婉柔的仪和乐观的珊，他们在逆境中求生存，感觉就像是你我故事的浓缩，故事尾声，行又恢复了工程师的本业，全也在报业上找到了目标，正当一切都值得庆祝之际，婉仪的哥哥和弟弟竟然为了赚钱不断使用卑劣手段，在工地偷工减料。都是我叫装的，我还能不记得？唉，就是太少了，这么多人，不够吃哩。江海市，夏天的“桃花运”接踵而来，三年前私定终身的，天才少女乔小乔，江海女首富叶梦莹，江海医院医花柳云曼，江海警花冷冰冰都钟情于他，涉世未深的呆萌少年该如何选择。与此同时，高名扬却痴情于柳云曼，一心想要得到柳云曼；苏小灿深爱着叶梦莹，为了叶梦莹，多次与叶少杰对抗。高名扬、叶少杰、乔东海不断“找茬”于夏天，夏天一个人又该如何与三人对抗，阴医门与鬼医门的恩怨逐渐浮出水面Therefore, the opportunity and duration of the NPC and CPPCC reporters' questions are all very tight in the eyes of their peers. It is also because of this that conflicts among journalists in major conferences often occur.Episode 3