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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.Lin Wei, founder of Golden Rainforest: "Recently, the country has issued a series of policies to rectify the off-campus training of K12 disciplines. However, the market demand is great, and counseling agencies of various disciplines are also seeking transformation. Therefore, quality education including thinking ability training will enter a faster development stage in the future. However, compared with subject counseling, the training of thinking ability is more comprehensive and the training process is more complicated. Therefore, higher requirements are put forward for the professional ability and industry cognition of industry practitioners. "咱们家做糖，熬的糖稀你们都见过吧？要是洒一坨到桌上，也跟那东西差不多了。CBS过去宣布直接预订13集动作冒险剧《血宝藏 Blood & Treasure》，这部预定19年夏季档播出的新剧由Matt Federman及Stephen Scaia执笔，剧中讲述一个聪明的古董专家Danny与一个狡猾的艺术品窃贼Lexi联手，合作追捕一个无情﹑以盗宝再转卖的方式资助自己进行攻击袭击的恐怖分子。然而当二人穿越各地追踪目标时，他们意外发现自己正身处「文明摇篮」那长达2000年历史的战争中。 　　Sofia Pernas饰演女主Lexi Vaziri，她是个热情﹑爱冒险﹑迷人的女子，过去她为了反抗古董商老爸及沉闷的寄宿学校，摇身一变成了世界级的艺术品窃贼；然而她父亲死于恐怖分子的袭击后，Lexi决心以自己的才能及对地下社会的认识来追捕恐怖分子并为父亲报仇。 　　Matt Barr饰演男主Danny，机智聪明的他可谓是个天生调查员，有着道德指南的Danny在FBI精英部门「Arts and Antiquities」中追查各被恐怖份子用作资助的艺术品。作为队中新星的他因一次失败而无法原谅自己，不过他终于看到救赎的机会……问题是这代表他得与罪犯Lexi合作起来。Let's start from the beginning. MotionEvent.ACTION_DOWN was introduced before. What is mFirstTouchTarget? The following code indicates that when the ViewGroup click event is consumed by the sub-View, the mFirstTouchTarget will point to the sub-View. Therefore, if the event is consumed by the View or is an ACTION_DOWN event, then access the ViewGroup's onInterceptTouchEvent, and if not, it is all intercepted by the current ViewGroup. In other words, if the View decides to intercept events, then this sequence of events will be handled by the View.I. Role黄豆道：张家玉米是怎么回事，内幕如何，必须根据案情进展才能解开。