Data centers have always been secure, tightly controlled facilities. 9/11 brought about changes that pushed security and physical protections to even higher levels. New data centers are more likely to be built outside of urban areas. The NYSE Euronext facility recently opened in New Jersey has a moat that protects part of the 400,000-square-foot complex. The need for stronger defenses has helped commercial data center providers, which have typically put a lot of focus on security, expert says.”]
Source: https://www.csoonline.com/article/2128464/how-9-11-changed-data-centers.html