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Internet Performance for Dummies

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Internet Performance For Dummies, Dyn Special Edition 22 These materials are © 2015 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Either way, DNS can be leveraged to route end users to a better performing location. Sending an end user to a "bad" endpoint is bad for business — it negatively impacts their entire experience with your website. Dyn's Global Consumer Online Shopping Expectations 2015 Report found that nearly 65 percent of all consumers sur- veyed aren't willing to wait more than three seconds for a web page to load. Over the past several years, Content Delivery Networks (CDNs) have become increasingly popular. CDNs (discussed in Chapter 2) cache static webpage content on servers around the world. A single web page load often requires multiple DNS requests, which creates multiple opportunities to optimize Internet Performance by routing an end user to the most opti- mal endpoints, or multiple risks to Internet Performance if an end user is routed to suboptimal endpoints. For example, static images or video can be pulled from a server that is geo- graphically much closer to a user, which improves end user performance. Dynamic content, such as the results of a data- base query or a website search engine, can be delivered by one of the company's web servers from the most optimal data center for that particular session. Finally, all of these DNS requests and responses must be routed across numerous interconnected networks to deliver the con- tent or asset to the end user. Each network can adversely affect end‐user performance, both directly and indirectly. A slow net- work along the direct path between the end user and the com- pany's website will obviously have a negative impact on the end‐user's experience. But less obvious, a slow network host- ing a CDN's servers in Brazil, for example, can also have a nega- tive impact on the end‐user experience. Thus, it's important for a business to understand which networks and external factors its customers will rely on to reach the company's website. Managing Service‐Level Agreements (SLAs) SLAs are essentially contracts between a service provider and a customer guaranteeing a minimum level of performance. SLAs may exist between any sort of service provider and

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