![]() ![]() The resulting tightly integrated overlay uses web caching, server-load balancing, request routing, and content services. As a result, the core network is specialized, simplified, and optimized to only forward data packets.Ĭontent Delivery Networks augment the end-to-end transport network by distributing on it a variety of intelligent applications employing techniques designed to optimize content delivery. ![]() This principle keeps the core network relatively simple and moves the intelligence as much as possible to the network end-points: the hosts and clients. The Internet was designed according to the end-to-end principle. Subresource Integrity mechanism was created in response to ensure that the page loads a script whose content is known and constrained to a hash referenced by the website author. ĬDNs serving JavaScript have also been targeted as a way to inject malicious content into pages using them. As such these services are being pointed out as potential privacy intrusion for the purpose of behavioral targeting and solutions are being created to restore single-origin serving and caching of resources. Security and privacy ĬDN providers profit either from direct fees paid by content providers using their network, or profit from the user analytics and tracking data collected as their scripts are being loaded onto customer's websites inside their browser origin. These sets of PoPs can be called "edges", "edge nodes", "edge servers", or "edge networks" as they would be the closest edge of CDN assets to the end user. Most CDN providers will provide their services over a varying, defined, set of PoPs, depending on the coverage desired, such as United States, International or Global, Asia-Pacific, etc. In an optimal scenario, these two goals tend to align, as edge servers that are close to the end user at the edge of the network may have an advantage in performance or cost. When optimizing for cost, locations that are least expensive may be chosen instead. This may be measured by choosing locations that are the fewest hops, the lowest number of network seconds away from the requesting client, or the highest availability in terms of server performance (both current and historical), so as to optimize delivery across local networks. When optimizing for performance, locations that are best for serving content to the user may be chosen. Requests for content are typically algorithmically directed to nodes that are optimal in some way. Others build a global network and have a small number of geographical PoPs. The number of nodes and servers making up a CDN varies, depending on the architecture, some reaching thousands of nodes with tens of thousands of servers on many remote points of presence (PoPs). Benefits include reducing bandwidth costs, improving page load times, or increasing global availability of content.
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