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　　The content of the website is stored on the source server, and the CDN is the cache of the content. Users are only allowed to access the CDN. If the content is not on the CDN, the CDN sends a request to the source server. In this way, as long as the CDN is large enough, it can resist great attacks. However, this method has a premise that most of the content of the website must be statically cached. For websites (such as forums) with dynamic content as the main content, we must think of other ways to minimize users' requests for dynamic data.可是随着时间的推移，他的锐气也在北逐渐地消磨。Column Title: Zhengda Variety ShowWhen the process is reasonable, When contingency plans are adequate, It is time to show the real strength. Look at the recovery situation after the emergency. The main reference is that the business interruption time is generally less than 10min-15min, which depends on the importance of the business and cannot be determined in a word. Then there is the business recovery time. The shorter the recovery time, the simpler and more efficient the plan. Finally, there is the business recovery situation, and the corresponding business tests are directly carried out.In the past few years, we have seen an explosive growth in underground services aimed at helping cyber criminals create undetectable payloads, the most famous of which is FUD (completely undetectable) payloads in the secret world. These services range from test services that allow testing payloads against all antivirus software to automatic packagers aimed at confusing malicious documents in a way that makes them undetectable. The screenshot above shows two such services.119. X.X.110