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Internet-knudepunkt
Noget af USAs datanetinfrastruktur kaldet ESnet. ESnet er et eksempel på en national backbone.[1] De små (typisk orange) ringe, hvor linjerne mødes, er internet-knudepunkter.
Hvis en internetudbyder ikke er forbundet til en IXP vil data fra en lokal geografisk bruger til en anden lokal geografisk bruger (hos en anden internetudbyder) skulle en tur til fx udlandet - for så at komme tilbage til det samme lokale geografiske område. Denne omvej giver unødig dataforsinkelse og dataforsinkelsesvariation - og fylder internetudbydernes udenlandske dataforbindelser op, hvilket koster dem og deres brugere penge. Herudover bliver internetudbydernes (og brugernes) dataforbindelse mere fejltolerant grundet flere dataveje mellem internetudbyderne.[6]
^es.net: Network Maps. 400Gbps, Intelligent Infrastructure for Science Citat: Citat "...ESnet is a high-performance national network built and engineered specifically for the purpose of science data transport. ESnet connects more than 40 Department of Energy research sites, including the entire National Laboratory system, its supercomputing facilities, and its major scientific instruments. ESnet also connects to 140 research and commercial networks, permitting tens of thousands of DOE-funded scientists around the world to collaborate productively...ESnet's nationwide backbone connects scientists across the U.S. and around the globe. (Select image to enlarge.) »Download the full-size ESnet network map...", backup
^ abDanish Internet Exchange Point Citat: "...The Danish Internet Exchange Point (DIX) is a facility operated by i2, with four points of presence:...The purpose of the DIX is to alleviate the exchange of data traffic between networks that constitute the Danish part of the global Internet structure...", backup