Internet Performance for Dummies

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Page 26 of 52

These materials are © 2015 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Website, Application, and Service Dependencies In This Chapter ▶ ▶ Understanding how websites work ▶ ▶ Getting the most out of service‐level agreements I n this chapter, you learn how websites work (at a very high level) and how to ensure your ISP is performing to standards. How Websites Work As discussed in Chapter 1, thousands of variables can affect the end users' web experience from their browser to your website. When a user enters a website address in her browser, as many as 10 to 20 DNS requests are sent to a DNS server that has been specified for that user's network (see Chapter 2 for a discussion of DNS). The DNS server answers these queries with the IP addresses of the various endpoints (web servers) that comprise your website. This is the first step of the jour- ney to your website. Poor website performance often results from routing an end user to a less‐than‐optimal endpoint. Sending an end user to a suboptimal endpoint will affect her entire session — page after page, downloaded image after downloaded image. That endpoint could be geographically far away from the end user, or it could be located in a poorly performing data center. Chapter 3

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