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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.ViewGroup's interceptor onInterceptTouchEvent is not intercepted by default, so return super.onInterceptTouchEvent () = return false;筹备好的节日晚宴，因为她要为一个临产的女青年墨非接生。 　　即将手术的时候，张静芳发现墨菲姑娘是一个单亲妈妈。随后医院里又冲进来一群不速之客——使墨非怀孕的男性一家赶来了，他们跟墨非的家人展开了尖锐的谈判，要求用金钱买走即将诞生的孩子。两下里讨价还价，舌剑唇枪，最终恶言相向，拍案走人。 　　孩子诞生了，张静芳为成功地迎来一个小生命而欣慰的同时，也为又一个单身妈妈而怜惜。正当疲惫的她准备回家时，噩耗传来——丈夫在驾车来医院接她的路上遇见车祸死亡。这一瞬间，张静芳也变成了无数个单亲妈妈中的一员。从此后，新的单亲妈妈张静芳，墨非，以及两个老的单亲妈妈西曼和米宝湘四人走到了一起，成为了“单亲妈妈四人组”。单亲妈妈的生活是艰辛的，坚持工作的同时还要养育孩子。另一方面，她们还要承受社会对她们的看法，毕竟“寡妇门前是非多”。更难过的是失去了丈夫之后所要承受的孤独和无助。艾利欧的家被拆了后，建起了游乐园。某次小樱和知世经过时，小樱发觉了不一样的气息，追随着跑进游乐园，结果撞上了一个人，抬头一看发现竟然是小狼。原来小狼和莓玲趁暑假来日本玩。再次和小狼相见，让小樱非常紧张也在寻找表达心意的机会，但无奈都被阴差阳错的打乱。而这时，小樱发现自己的牌变少了，而牌走失的方向正是游乐园。传说中被封印的最后一张卡片，艰难的战斗，小樱能否胜利？而她是否又能向小狼成功传达心意呢？当天，启明影视便在微.博上推出专门的宣传号，宣告了这一消息。211. X.X.54