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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.One by one, the maids entered Chunhui Hall with all kinds of things in their hands and looked at those common or unusual things. Even if they were as bad-tempered as the princess of Shu, they felt a little more confident.　　11. Os.getcwd ()--Get current work dir照亮童年，为爱发光！七位导演取材原创绘本改编七个短片，以爱为主轴串联，从不同视角讲述“我和我的童年”。该片聚焦亲子关系、人与自然、兄弟手足、睦邻之情、异地成长等故事题材，用水墨、剪纸、水彩等不同的艺术形式，展现了独特而治愈的国风美学，唤起了全民心底关于童年最深处的情感共鸣。