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Internet Performance for Dummies

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Chapter 2: Internet 101 17 These materials are © 2015 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. ✓ Continuous availability ✓ Global reachability ✓ High performance ✓ Resilience ✓ Scalability ✓ Security ✓ Technical expertise and support CDNs A Content Deliver Network (CDN) is a system of distributed servers that deliver web content (such as high‐resolution images and streaming videos) to a user based on the following: ✓ Geographic location of the user ✓ Origin of the webpage ✓ Current availability and load of a content delivery server CDNs speed the delivery of content for websites with high traf- fic volumes and global reach. A CDN caches the content and images of a subscriber website to a network of servers that are dispersed at different geographic locations around the world. When a website visitor requests a webpage that is part of a CDN, the request is redirected from the originating site's server to a server in the CDN that is closer to the visitor to deliver the content. The CDN will also communicate with the originating server to deliver any content that has not been previously cached. Generally, the closer the CDN server is to the visitor geographically, the faster the content will be deliv- ered to the visitor. CDNs are particularly effective for optimizing content to mobile devices and for handling large surges in web traffic (for example, due to sporting events, online ticket sales, and sales). CDN deployments are surging as organizations from web and Fortune 1000 enterprises to startups and small‐to‐medium businesses (SMBs), connect with customers and derive more revenue from the web.

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