User:AnimusCrypta/internetbackbonesandbox

= Internet Backbone =

READY FOR GRADING The Internet backbone may be defined by the principal data routes between large, strategically interconnected computer networks and core routers on the Internet.

These data routes are hosted by commercial, government, academic, and other high-capacity network centers. These centers include, but are not limited to, the Internet exchange points and network access points that exchange Internet traffic between countries, continents, and across the oceans. Internet service providers, often Tier 1 networks, participate in Internet backbone traffic by privately negotiated interconnection agreements. These agreements are primarily governed by the principle of settlement-free peering.

The Internet, and consequently its backbone networks, do not rely on central control or coordinating facilities, nor do they implement any global network policies. The resilience of the Internet results from its principal architectural features, such as placing as few network state and control functions as possible within network elements, and 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 of redundancy of today's network links and sophisticated real-time routing protocols provide alternate paths of communications for load balancing and congestion avoidance.

The largest providers, known as Tier 1 providers, have such comprehensive networks that they do not need to purchase transit agreements from other providers. As of 2019 there are six Tier 1 providers in the telecommunications industry, which are: CenturyLink (Level 3), Telia Carrier, NTT, GTT, Tata Communications, and Telecom Italia.

Infrastructure
The Internet backbone is made up of many networks owned by numerous companies. It is typically a fiber optic trunk line. The trunk line consists of many fiber optic cables bundled together to increase the capacity, or bandwidth, of the line, though the data rates of backbone lines have increased over time. Fiber-optic cables remain the medium of choice for Internet backbone providers for several reasons. Fiber-optics allow for fast data speeds and large bandwidth, they suffer relatively little attenuation, allowing them to cover long distances with few repeaters, and they are also immune to crosstalk and other forms of electromagnetic interference which plague electrical transmission. The real-time routing protocols and redundancy built into the backbone is also able to reroute traffic in case of a failure. The data rates of backbone lines have increased over time. In 1998, 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 have data rates of 2,488 Mbit/s or faster by the mid 2000s.

Secondary Uses of Infrastructure
While serving as the physical portion of the internet and facilitating the communicative practices afforded by it, other uses have been explored through various state and scientific groups. For example, undersea trunk lines were recognized by the U.S. Navy as a technology for underwater detection of enemy vessels in the 1950s, namely Soviet submarines. Contracting AT&T to develop a secret network of undersea cables based on their existing telegraph networks already in place on the seafloor, the Sound Surveillance System (SOSUS) was created. Utilizing hydrophones in addition to the current network infrastructure, a secondary network of listening posts was constructed on top of the original telegraph network, making up the surveillance system.These listening posts, supported by the existing infrastructure, could then locate enemy submarines up to 2,000 miles away. As telegraph cables began to be retired from their commercial use, scientists from around the world looking to gather marine data saw an opportunity. Through these retired systems, scientists from the University of Newcastle were able to research water movement through voltage differential along the path of the old cables. Another scientist from the University of Edinburgh was able to gather unparalleled data on plate tectonics and continental drift via the retired cable lines, while a joint venture between London University and the University of California saw the founding of Fanning Island Station. Through the station they established, the group was able to research the geophysical processes of the Earth in the Pacific by taking measurements at a large cable terminus on Fanning Island. While Fanning Island Station eventually closed in the 1960s, it became the foundation for something much larger. The Hawaiian Oceanographic Institute's Pacific Equatorial Research Laboratory (PERL) has operated on the original Fanning Island Station site since briefly after it closed, providing a large body of data surrounding meteorology, equatorial currents, and general oceanography that has since contributed to the global database of climate change research.

History
The first packet-switched computer network was the NPL network, followed closely by the ARPANET. The latter used a backbone of routers called Interface Message Processors. Both the NPL and ARPANET networks were interconnected in 1973, while other packet-switched computer networks began to proliferate in the 1970s, eventually adopting TCP/IP protocols or being replaced by newer networks. The National Science Foundation created NSFNET in 1986 by funding six networking sites using 56 kbit/s interconnecting links and peering to the ARPANET. In 1987, this new network was upgraded to 1.5 Mbit/s T1 links for thirteen sites. These sites included regional networks that in turn connected over 170 other networks. IBM, MCI and Merit upgraded the backbone to 45 Mbit/s bandwidth (T3) in 1991. 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-sponsored network access points (NAPs), until the government privatized the Internet, and transferred the NAPs to commercial providers.

Modern Backbone
Because of the enormous overlap between long-distance telephone networks and backbone networks, the largest long-distance voice carriers such as AT&T Inc., MCI (acquired in 2006 by Verizon), Sprint, and CenturyLink also own some of the largest Internet backbone networks. These backbone providers sell their services to Internet service providers (ISPs).

Each ISP has its own contingency network and is equipped with an outsourced backup. These networks overlap to create a redundant network. Many companies operate their own backbones which are all interconnected at various Internet exchange points (IXPs) around the world. 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 and are capable of directing data to other routers in order to send it to its final destination. Without them, information would be lost.

Peering agreements
Backbone providers of roughly equivalent market share regularly create agreements called peering 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 regardless.

Regulation
Antitrust authorities have acted to ensure that no provider grows large enough to dominate the backbone market. In the United States, the Federal 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.

Transit agreements
Backbone providers of unequal market share usually create agreements called transit agreements, and usually contain some type of monetary agreement.

Egypt
The government of Egypt shut down the four major ISPs on January 27, 2011 at approximately 5:20 p.m. EST. Evidently, the networks had not been physically interrupted, as the Internet transit traffic through Egypt, such as traffic flowing from Europe to Asia, was unaffected. Instead, the government shut down the Border Gateway Protocol (BGP) sessions announcing local routes. BGP is responsible for routing traffic between ISPs.

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. Other ISPs started to offer free dial-up Internet access in other countries.

Europe
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. The company Level 3 Communications began to launch a line of dedicated Internet access and virtual 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.

Caucasus
Certain countries around the Caucasus have very simple backbone networks; for example, in 2011, a woman in Georgia pierced a fiber backbone line with a shovel and left the neighboring country of Armenia 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.

Japan
Japan's Internet backbone needs to be very efficient due to 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 a fiber-optic backbone line of Nippon Telegraph and Telephone (NTT), a domestic backbone carrier, in order to deliver this service at cheaper prices.

China
There are some instances where the companies that own certain sections of the Internet backbone's physical infrastructure depend on a healthy amount of competition in order to keep the nation's Internet market profitable. This can be seen most prominently in China. Due to the fact that China Telecom and China Unicom have acted as the sole Internet Service Providers to China for some time, smaller companies competing with them usually do not stand a chance when it comes to 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/or stagnation and ultimately effects the efficiency of the Internet backbone networks that service the nation.