Info on CDN technology
Different companies offer
CDN nodes in different locations. The CDN use allows to narrow the costs on traffic, to make the content availability better in different points of the world. The number of nodes among every provider is different as well as the number of servers.
The queries for content usually are coming o nodes via the optimal route. During the optimization process the nodes that are able to bring content to the end user with maximum performance are chosen. Nevertheless the optimization can be also according to the cost - sometimes the nodes with cheaper traffic are chosen and they may not be optimal in terms of routes.
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