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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.Image而且熊心一番说辞头头是道，极为老练，看来尹旭说的不错，这个这个牧童太子真的不简单。主角马向南突然失业失恋后峰回路转再发现自己有个土豪亲爹，但是亲爹死了留下一份遗嘱，要求所有继承人必须在48小时之内到葬礼现场，由12位评审团决定遗产归属。同父异母的弟弟妹妹花钱买凶，两天一夜各方势力互相拆台，笑料百出。但派来的杀手竟无形中保护了主人公有惊无险的来到了葬礼现场，但就在这时主人公才发现，葬礼更是一个布满了机关的战场，他的亲爹并没有死。《王女自鸣鼓》是2009年又一部女性题材的大河历史剧，该剧以高句丽初期乐浪公主和好童王子的传奇故事为背景，讲述了乐浪公主和姐姐自鸣公主，以及夹在两人中间的好童王子三人之间伤感的爱情故事。剧中朴敏英扮演的乐浪公主虽然是乐浪王崔理的第二位夫人所生，但从小就作为乐浪国的后继人学习帝王之道。乐浪国有一个神奇的自鸣鼓，每当有外族侵略来袭，自鸣鼓都会发出响声，从而击退侵略者。由于自鸣鼓的存在，北方的霸主高句丽的屡次进攻都失败了。然而当乐浪公主遇到潜入乐浪国，企图销毁自鸣鼓的高句丽好童王子后，她的命运发生了改变。爱上了好童的乐浪公主为了自己的爱情不惜亲手撕毁了自鸣鼓，从而导致了乐浪国的灭亡。身为高句丽大武神王的长子，好童王子（郑京浩 饰）从小就知道成为像父亲一样神武的王就是自己的命运。外貌出众、充满智慧和野心的好童王子被百姓推崇为朱蒙转世。坚信没有爱情可以生活，但丧失了王权则没有办法生存的好童王子却因为三个女人而苦恼不已。好童王子的母亲是敌国扶余的公主，这让好童王子痛苦不已。欲吞并乐浪国的好童王子却爱靠打假拳混日子的艾迪生，本来和正义感十足的体育记者马小是一对冤家，没想到因为一场意外的电击，男女身体互换。性别错乱后，两人互坑互害，引发了拳坛的大地震，也揭开了假拳界的秘密，惹来一堆麻烦，最终两人在“卷莲门”副掌门张茱萸的指点下，向恶势力挥起了羞羞的铁拳！