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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.The main purpose of the meta-sharing mode is to realize the sharing of objects, i.e. The shared pool, which can reduce the memory overhead when there are many objects in the system and is usually used together with the factory mode.《第三种魅力》是讲述陷入虽然不特别、但在彼此眼里闪耀的全新的“第三种魅力”的两个男女，一起经过20岁的春天，27岁的夏天，32岁的秋天，描写恋爱的四季的12年间的恋爱叙事诗。徐康俊饰演异次元的现实型模范生温俊英，李絮饰演像活火山一样的女子李英彩。温俊英是一个非比寻常的有规划且细腻的人，也是一个敏感的异次元的现实型的人。和流行相去甚远的眼镜、笔挺的牛仔裤和白色袜子以及一尘不染的球鞋，如果要定义20岁的俊英的话，那就是“标准的模范生”。为了凑人数他参加了人生第一次联谊，在那里他遇到了鸡婆且声音巨大的英彩，诞生了他人生中唯一一次没有按照计划实行的恋爱。而李英彩则是冲动、热血、率性的魅力女子。她父母双亡，和哥哥相依为命，在别人玩耍的时候，拼命工作成为有钱人是她的目标。她20岁时放弃读大学，选择成为美容师助手，正式踏入社会，她的第一次“校园生活”是被朋友硬拉着参加的联谊，在那里她遇到了和自己完全相反的男人俊英。兔二、玄影等功夫学校的小伙伴们每天在学校里开心的练武，快乐的生活。突然有一天，功夫学校对面一夜之间冒出一家充满科技感的“神府学校”，吸引了大批小朋友去报名。于是，两家学校就开始了一场“传统”与“科技”的较量……。功夫学校的老师接连失踪，同学一个个离去，兔二、玄影两个性格迥异的孩子默默的守护着自己深爱的学校。这时，一些奇奇怪怪的机器人出现在他们的面前…… 咔嚓、咔嚓、 呲………尹旭兴奋道：黄大夫，这绿萝保胎的事情还需要多劳烦伱了。迪亚兹一家有七个孩子，排行中间的哈莉无疑是这个家中最没有存在感的孩子。但事实果真如此吗？她忙着照顾一大家子人的饮食起居，经常用自己的小发明解决大家庭的难题。她就像万能胶，让九口之家紧紧团结在一起。看看这个小女生是怎么撑起半边天的吧！