TheInternet backbone is theprincipal data routes between large, strategically interconnectedcomputer networks andcore routers of theInternet. These data routes are hosted by commercial, government, academic and other high-capacity network centers as well as theInternet exchange points andnetwork access points, which exchange Internet traffic internationally.Internet service providers (ISPs) participate in Internet backbone traffic through privately negotiatedinterconnection agreements, primarily governed by the principle of settlement-freepeering.
The Internet, and consequently its backbone networks, do not rely on central control or coordinating facilities, nor do they implement any global network policies. Theresilience of the Internet results from its principal architectural features, such as the idea of placing as few networkstate and control functions as possible in the network elements, instead relying on the endpoints of communication to handle most of the processing to ensure data integrity, reliability, and authentication. In addition, the high degree ofredundancy of today's network links and sophisticated real-timerouting protocols provide alternate paths of communications forload balancing and congestion avoidance.
The largest providers, known asTier 1 networks, have such comprehensive networks that they do not purchasetransit agreements from other providers.[1]
The Internet backbone consists of many networks owned by numerous companies.
Fiber-optic communication remains the medium of choice for Internet backbone providers for several reasons. Fiber-optics allow for fast data speeds and largebandwidth, suffer relatively littleattenuation — allowing them to cover long distances with fewrepeaters — and are immune tocrosstalk and other forms of electromagnetic interference.[citation needed]
The real-time routing protocols and redundancy built into the backbone is also able to reroute traffic in case of a failure.[2] The data rates of backbone lines have increased over time. In 1998,[3] all of the United States' backbone networks had utilized the slowest data rate of 45 Mbit/s. However, technological improvements allowed for 41 percent of backbones to havedata rates of 2,488 Mbit/s or faster by the mid 2000s.[4]
The first packet-switched computer networks, theNPL network and theARPANET were interconnected in 1973 viaUniversity College London.[5] The ARPANET used a backbone of routers calledInterface Message Processors. Other packet-switched computer networks proliferated starting in the 1970s, eventually adopting TCP/IP protocols or being replaced by newer networks.
The National Science Foundation created theNational Science Foundation Network (NSFNET) in 1986 by funding six networking sites using56kbit/s interconnecting links, with peering to the ARPANET. In 1987, this new network was upgraded to1.5Mbit/sT1 links for thirteen sites. These sites included regional networks that in turn connected over 170 other networks.IBM,MCI andMerit upgraded the backbone to45Mbit/s bandwidth (T3) in 1991.[6] The combination of the ARPANET and NSFNET became known as the Internet. Within a few years, the dominance of the NSFNet backbone led to the decommissioning of the redundant ARPANET infrastructure in 1990.
In the early days of the Internet, backbone providers exchanged their traffic at government-sponsorednetwork access points (NAPs), until the government privatized the Internet and transferred the NAPs to commercial providers.[1]
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Because of the overlap and synergy between long-distance telephone networks and backbone networks, the largest long-distance voice carriers such asAT&T Inc.,Verizon,Sprint, andLumen also own some of the largest Internet backbone networks. These backbone providers sell their services to Internet service providers.[1]
Each ISP has its own contingency network and is equipped with an outsourced backup. These networks are intertwined and crisscrossed to create a redundant network. Many companies operate their own backbones which are all interconnected at variousInternet exchange points around the world.[7] In order for data to navigate this web, it is necessary to have backbone routers—routers powerful enough to handle information—on the Internet backbone that are capable of directing data to other routers in order to send it to its final destination. Without them, information would be lost.[8]
Backbone providers of roughly equivalent market share regularly create agreements calledpeering agreements, which allow the use of another's network to hand off traffic where it is ultimately delivered. Usually they do not charge each other for this, as the companies get revenue from their customers.[1][9]
Antitrust authorities have acted to ensure that no provider grows large enough to dominate the backbone market. In the United States, theFederal Communications Commission has decided not to monitor the competitive aspects of the Internet backbone interconnection relationships as long as the market continues to function well.[1]
Backbone providers of unequal market share usually create agreements calledtransit agreements, and usually contain some type of monetary agreement.[1][9]
During the2011 Egyptian revolution, the government ofEgypt shut down the four major ISPs on January 27, 2011 at approximately 5:20 p.m. EST.[10] The networks had not been physically interrupted, as the Internet transit traffic through Egypt was unaffected. Instead, the government shut down theBorder Gateway Protocol (BGP) sessions announcing local routes. BGP is responsible for routing traffic between ISPs.[11]
Only one of Egypt's ISPs was allowed to continue operations. The ISP Noor Group provided connectivity only to Egypt's stock exchange as well as some government ministries.[10] Other ISPs started to offer free dial-up Internet access in other countries.[12]
Europe is a major contributor to the growth of the international backbone as well as a contributor to the growth of Internet bandwidth. In 2003, Europe was credited with 82 percent of the world's international cross-border bandwidth.[13] The companyLevel 3 Communications began to launch a line of dedicated Internet access andvirtual private network services in 2011, giving large companies direct access to the tier 3 backbone. Connecting companies directly to the backbone will provide enterprises faster Internet service which meets a large market demand.[14]
Certain countries around theCaucasus have very simple backbone networks. In 2011, a 70-year-old woman inGeorgia pierced afiber backbone line with a shovel and left the neighboring country ofArmenia without Internet access for 12 hours. The country has since made major developments to the fiber backbone infrastructure, but progress is slow due to lack of government funding.[15]
Japan's internet backbone requires a high degree of efficiency to support high demand for the Internet and technology in general. Japan had over 86 million Internet users in 2009, and was projected to climb to nearly 91 million Internet users by 2015. Since Japan has a demand for fiber to the home, Japan is looking into tapping afiber-optic backbone line ofNippon Telegraph and Telephone (NTT), a domestic backbone carrier, in order to deliver this service at cheaper prices.[16]
In some instances, the companies that own certain sections of the Internet backbone's physical infrastructure depend on competition in order to keep the Internet market profitable. This can be seen most prominently inChina. SinceChina Telecom andChina Unicom have acted as the sole Internet service providers to China for some time, smaller companies cannot compete with them in negotiating the interconnection settlement prices that keep the Internet market profitable in China. This imposition of discriminatory pricing by the large companies then results in market inefficiencies and stagnation, and ultimately affects the efficiency of the Internet backbone networks that service the nation.[17]
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