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Peering & Content Delivery - Overview – Google Peering & Content Delivery: " . . . Original content is hosted within Google data centers. The content is replicated to multiple data centers for redundancy and more efficient serving to our end users. We then distribute this content across our network and closer to users, using the Google backbone network. Google Global Cache (GGC) represents the final tier of Google’s content delivery platform, and is closest to users. With GGC, network operators and Internet Service Providers deploy a small number of Google servers inside their network to serve popular Google content, including YouTube. Google's traffic management system directs users to the node that will provide the best performance for the user. GGC can be located anywhere in an operator's network to maximize savings in backbone and transit bandwidth. Targeted deployment can reduce the number of route-miles traveled on an operator's network to serve Google traffic, further increasing cost savings for the operator. While cache hit rates vary based on the unique consumption patterns of end users on each operator's network, typically between 70-90% of Google cacheable traffic can be served from GGC. . . ."
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