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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.段落二，讲述的是这三个人长到了40来岁，变成了三个臭皮匠。他们走到了社会上，在社会上闹出的各种各样的喜剧和笑话。屌丝青年朱大吉（程野饰）诸事不顺，意外获得猪八戒神力加持，但也中了神力魔咒。他在实现人生逆袭的同时，一步步迷失了自己，也丢掉了小馨的真爱……面临名利与爱情的选择时，他最终地选择了后者，在小馨不离不弃的真爱的感化下，魔咒获得解除，他和小馨事业爱情双丰收。诸事大吉……故事发生在太行山深处、王莽岭脚下的沟里村。山修路，凿穿王莽岭的工程5年前进了100米。小庄计算这样干还得用80年，老支书听后惊呆了。小庄为竞选村长和老支书产生了误会。 　　小庄带领大家集资买电钻，新的工程开始了。老支书重新认识了小庄，却为排险石而牺牲。 　　除夕夜小庄一人守在工地，菊香为他送来了饺子，二人和好。结婚时，村民认为菊香名声不好，没人前来祝贺，菊香流下凄楚的眼泪。 　　小庄为动员村民上山修路，动手打了表弟大保。大保娘称赞小庄打得对，教育了儿子大保。一次爆破中大保重伤牺牲。 　　小庄的人格力量感动了沟里人，人们纷纷上山修路。路通了，全村人第—次看到了汽车进山，小庄来到了老支书和大保的坟前，默默地告慰在天之灵。Public void accept (Visitor visitor) {Japan 2.9 million 4 million 6.9 million　　克里斯不但面对着失忆的苦恼，如今还要应付这个棘手的计划，把人生的掌握权夺回自己手中。