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Black: JiuxiongThe attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.Stay with your horse and try it back.For Ethernet, the minimum packet length data segment must reach 46 bytes, while the attack message is only 40 bytes. Therefore, the network card will do some processing when sending, filling 6 zeros at the end of the TCP header to meet the minimum packet length requirement. At this time, the length of the entire packet is 14 bytes of Ethernet header, 20 bytes of IP header, 20 bytes of TCP header, plus 6 bytes of 0 filled due to the minimum packet length requirement, totaling 60 bytes.立即针对张家提出的控诉理由，加以深挖完善，并推荐了有名讼师过去。二十世纪三十年代的东海上，活跃着一位杀富济贫的海上女侠梁桂凤，她疾恶如仇，除暴安良，深受人民的拥戴。梁桂凤派人刺杀上海滩黑社会女老大顾四爷，但被老谋深算的顾四爷识破。她发誓要踏平梁桂凤的小岛。梁桂凤针锋相对，绑来了顾四爷的干女儿索菲及顾的男宠阿林，殊不知两个人是背着顾四爷私奔出走的，顾四爷正派人到处缉拿他们。女儿玉莲担心母亲会招惹麻烦，主张放走索菲与阿林，而梁桂凤的义子海龙则坚决反对，梁桂凤和女儿玉莲展开了一场明争暗斗……When x=3, ViewGroup2 has already blocked the event when x=3. Why did MyView still receive an event? If the action value of this event received by MyView is printed out with log, it is found to be ACTION_CANCEL, which indicates that this event has ended for non-human reasons. Let me give an example of the ACTION_CANCEL event. Generally, when we handle the event, we will record something in the down event and then clear the record in the up event. If you have a Button in ListView, When we hold down the Button, the button receives the down event. At this moment, the finger starts to slide, and the event will be intercepted by ListView. At this time, the button will never receive the up event again. However, when ListView intercepts the event, the button will receive the cancel event, indicating that the event is ended for non-human reasons. Therefore, Cancel can do what the up event wants to do at this time.