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A dozen means 12, and a dozen socks means 12 pairs.In the process of DNS resolution, the client initiates a query request, and the DNS server may need to make additional queries to complete the resolution process and give a response, which will consume certain computing and network resources. If an attacker uses a large number of controlled hosts to continuously send resolution requests for different domain names, the cache of the DNS server will be continuously refreshed, and the failure of a large number of resolution requests to hit the cache will cause the DNS server to consume additional resources for iterative queries, which will greatly increase the resource consumption of the DNS server.二更求粉。Knowing向左走向右走Storage XSS, persistent, code is stored in the server, such as personal information or published articles, add code, if there is no filtering or filtering is not strict, then these codes will be stored in the server, the user visits the page triggered code execution. This kind of XSS is more dangerous, easy to cause worms and steal cookies (although there is also a DOM type of XSS, it is still included in the storage type of XSS).