15.10. Summary
Potential benefits that a CDN offers to content providers include improved performance of their Web sites and protection from sudden demand surges called flash events. CDNs can be stand-alone companies that seek presence in networks of multiple ISPs (multi-ISP or colocation CDNs) or they can be services provided by a large ISP itself (single-ISP CDNs). CDNs can also be broadly classified into hosting CDNs, which maintain both surrogates (called CDN servers in the context of CDNs) and origin servers, and relaying CDNs that have only surrogates. Among relaying CDNs, one can distinguish between origin-first and CDN-first types of CDNs, depending on whether container HTML pages are served by the origin or CDN server.
Compared to CDN-first, ...
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