ECHOcommunity Case Study 2015 - Figure 3
Single server (left) versus Content Delivery Network (CDN) (right) - By Kanoha (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons