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According to Microsoft statistics, the upper limit of dynamic domain name queries that a DNS server can withstand is 9,000 requests per second. However, we know that tens of thousands of domain name resolution requests per second can be easily constructed on a P3 PC, which is enough to paralyze a DNS server with extremely high hardware configuration, thus showing the vulnerability of the DNS server. At present, the most commonly used DNS server software is the leading WINMYDNS in China and Bind abroad.刘蝉儿听了也十分踌躇：这些天，她跟小葱、秦淼、紫茄相处很好，也很喜欢跟师傅学医，自觉日子比在家有趣多了，想着要是真不学了，心里便不舍。现在，从遥远的银河尽头来的一位宇宙战士，在新的战场上奔驰！我走了，结局！！The multi-Reactor thread mode divides "accepting the connection request from the client" and "communicating with the client" into two Reactor threads to complete. MainReactor completes the operation of receiving the client connection request. It is not responsible for the communication with the client, but transfers the established connection to the subReactor thread to complete the communication with the client, so that the following client connection request will not be processed immediately due to the large amount of read () data. In addition, the multi-Reactor thread mode can also distribute massive connections to multiple subReactor threads by implementing the subReactor thread pool under the condition of massive concurrent requests from clients, which can greatly improve the application load and throughput in a multi-core operating system.1. Instructions for New Office:十万精锐败于项羽五万楚军，二比一的巨大优势下，全军覆没。