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他觉得跟这小子就不能好好说，于是哈哈笑了两声道：我瞪她？笑话。The 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.掌柜的急忙又上了一套碗筷并酒杯，加了几个碟子，不过是乡野腌制的小菜和羊肉而已，然后就任凭二人自便了。Note: Ref is used here to inject another objectIn this example, the policy pattern is used to encapsulate the algorithm. However, in practice, it can be used to encapsulate almost any type of rules, as long as the similarities between different rules are analyzed and abstractedPerception class: