(The full name of CDN is ContentDeliveryNetwork, that is, Content Delivery Network. Its purpose is to add a new layer of network architecture to the existing Internet, and to publish the content of the website to the "edge" of the network closest to the user, so that the user can obtain the desired content nearby. The problems of small bandwidth, large number of user visits, and unequal distribution of network sites can improve the response speed of users visiting the website.)
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