Yahoo! JAPAN had been operating their CDN across both data centers, supporting an aggregated bandwidth of 40Gbps. They also use a portion of the service infrastructure to support other initiatives, such as Yahoo! JAPAN News and Auction. However, Yahoo! JAPAN decided to build a new CDN to cope with the rapid spread of smart devices and the increase in traffic volume and session/connection numbers driven by rich content, such as videos and pictures. In addition to network devices, such as switches and routers that make up the core of the new CDN, a review began in the autumn of 2013 to introduce firewalls.