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Internet Performance for Dummies

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These materials are © 2015 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Internet 101 In This Chapter ▶ ▶ Learning about ISPs on the level ▶ ▶ Connecting networks with peering and transit arrangements ▶ ▶ Looking up addresses with your little black book, uh . . . DNS ▶ ▶ Using a CDN for speed, resilience, and much more I n this chapter, you learn how to play well with others. Actually, you learn how Internet Service Providers (ISPs) play well with each other (mostly) to bring you the World Wide Web — and why it matters. You also learn how the Domain Name System (DNS) and Content Delivery Networks (CDNs) work together to deliver better Internet Performance. ISP Levels It should come as no surprise that not all Internet Service Providers (ISPs) are created equal. If you're a business or resi- dential customer of an ISP, you probably classify the different ISPs based on criteria such as their performance, reliability, and customer service, using a descriptive hierarchy based on your personal experiences dealing with them: good, so‐so, or poor, for example! Companies such as ISPs watch speed, security, availability, and cost very carefully — in fact, most of them are really good at optimizing their infrastructure. But, they measure their optimization of the Internet, not yours, and often these mea- surements mismatch. The only company that can really mea- sure the effectiveness of the Internet for your business is you. Chapter 2

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