How do CDNs work 


The days of tabular layout and Flash animation are over, and finding a site with a main page less than 90 kilobytes in size is a challenge. Modern web resources are adaptive, technologically advanced, and load at lightning speed. How can we achieve this?

The best way is to use a cdn hosting of a reliable provider and enjoy this modern tool.

Caching and shielding

Caching is a part of CDN and means that content is loaded from the source server to CDN servers, from which it is distributed to site visitors depending on their geographic location. This positively affects the loading speed of the site.

CDN can serve any static content. For example, without this technology, it would be impossible to watch movies via Netflix and use social networks without delays.

However, this process does not occur instantly. The file can be changed on the source server, but on the caching ones, it remains unchanged for some time. To prevent such situations, the administrator must properly configure the cache update scripts.

An administrator can use various tools to configure caching. For example:

  • he can divide content by download priority and make sure that all heavy content is stored for a longer time or not deleted at all;
  • the administrator can warm up the network in advance by placing content in the cache beforehand.

Caching is a cyclical process that creates a load. The latter can bring the source server down. Shielding is used to protect it.

With the help of an intermediate server, the load on the main one is reduced, its response time does not increase, and the cache is updated without delay.

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Shielding increases the tolerance by protecting from overloads and reduces the burden on network administrators. Therefore, when choosing a provider, you should pay attention to the range of services. For example, with G-Core Labs one will have all the required components.

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