Peering is voluntary interconnection of administratively separate Internet networks for the purpose of exchanging traffic between the customers of each network. The pure definition of peering is settlement-free or "sender keeps all," meaning that neither party pays the other for the exchanged traffic, instead, each derives revenue from its own customers. Marketing and commercial pressures have led to the word peering routinely being used when there is some settlement involved, even though that is not the accurate technical use of the word. The phrase "settlement-free peering" is sometimes used to reflect this reality and unambiguously describe the pure cost-free peering situation. A computer network is a system for communication among two or more computers. ...

Peering requires physical interconnection of the networks, an exchange of routing information through the Border Gateway Protocol (BGP) routing protocol and is often accompanied by peering agreements of varying formality, from "handshake" to thick contracts. It has been suggested that Routing protocol be merged into this article or section. ... The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. ...

How peering works

The Internet is a collection of separate and distinct networks, each one operating under a common framework of globally unique IP addressing and global BGP routing. This article or section does not cite any references or sources. ... The border gateway protocol (BGP) is one of the core routing protocols in the Internet. ...

The relationships between these networks are generally described by one of the following three categories:

• Transit (or pay) - You pay money (or settlement) to another network for Internet access (or transit).
• Peer (or swap) - Two networks exchange traffic between each other's customers freely, and for mutual benefit.
• Customer (or sell) - Another network pays you money to provide them with Internet access.

Furthermore, in order for a network to reach any specific other network on the Internet, it must either: An Internet transit is an arrangement when one Internet service provider carries packets for another provider to or from the wider Internet. ...

• Sell transit (or Internet access) service to that network (making them a 'customer'),
• Peer directly with that network, or with a network who sells transit service to that network, or
• Pay another network for transit service, where that other network must in turn also sell, peer, or pay for access.

The Internet is based on the principle of global reachability (sometimes called end-to-end reachability), which means that any Internet user can reach any other Internet user as though they were on the same network. Therefore, any Internet connected network must by definition either pay another network for transit, or peer with every other network who also does not purchase transit.

Motivations for peering

Peering involves two networks coming together to exchange traffic with each other freely, and for mutual benefit. This 'mutual benefit' is most often the motivation behind peering, which is often described solely by "reduced costs for transit services". Other less tangible motivations can include:

• Increased capacity for extremely large amounts of traffic (distributing traffic across many networks).
• Increased control over your traffic (reducing dependence on one or more transit providers).
• Improved performance (attempting to bypass potential bottlenecks with a "direct" path).
• Improved perception of your network (being able to claim a "higher tier").
• Government regulations, or the desire to avoid the appearance of being a monopoly.

A monopoly (from the Greek language monos, one + polein, to sell) is defined as a persistent market situation where there is only one provider of a product or service, in other words a firm that has no competitors in its industry. ...

Physical interconnections for peering

Scheme of interconnection and peering of autonomous systems

The physical interconnections used for peering are categorized into two types: Image File history File links Size of this preview: 800 × 541 pixelsFull resolution (844 × 571 pixel, file size: 49 KB, MIME type: image/png) Tools used: Dia, quite obviously. ... Image File history File links Size of this preview: 800 × 541 pixelsFull resolution (844 × 571 pixel, file size: 49 KB, MIME type: image/png) Tools used: Dia, quite obviously. ...

• Public peering - Interconnection utilizing a multi-party shared switch fabric such as an Ethernet switch.
• Private peering - Interconnection utilizing a point-to-point interconnection such as a patch-cable or dark fiber between two parties.

Ethernet is a large, diverse family of frame-based computer networking technologies that operates at many speeds for local area networks (LANs). ... In fibre-optic communications, dark fibre or unlit fibre (or fiber) is the name given to individual fibers that have yet to be used within cables that have been already laid. ...

Public peering

Public peering is accomplished across a Layer 2 access technology, generally called a shared fabric. At these locations, multiple carriers interconnect with one or more other carriers across a single physical port. Historically public peering locations were known as network access points (NAPs), today they are most often called exchange points or Internet exchanges ("IXP" or "IX"). Many of the largest exchange points in the world can have hundreds of participants, and some span multiple buildings and colocation facilities across a city. Network Access Point (NAP) is the original term for the data communications facilities built in the early days of the Internet to provide on-ramp access to higher-speed Internet links (which were typically transcontinental or intercontinental in extent). ... // An Internet exchange point (IX or IXP) is a physical infrastructure that allows different Internet Service Providers (ISPs) to exchange Internet traffic between their networks (autonomous systems) by means of mutual peering agreements, which allow traffic to be exchanged without cost. ... A colocation centre (colo) or carrier hotel is a type of data center where multiple telecommunications network or service providers, such as telcos or ISPs, site their connections to one anothers networks (points of presence). ...

Since public peering allows networks interested in peering to interconnect with many other networks through a single port, it is often considered to offer "less capacity" than private peering, but to a larger number of networks. Many smaller networks, or networks who are just beginning to peer, find that public peering exchange points provide an excellent way to meet and interconnect with other networks who may be open to peering with them. Some larger networks utilize public peering as a way to aggregate a large number of "smaller peers", or as a location for conducting low-cost "trial peering" without the expense of provisioning private peering on a temporary basis, while other larger networks are not willing to participate at public exchanges at all.

A few exchange points, particularly in the United States, are operated by commercial carrier-neutral third parties. These operators typically go to great lengths to promote communication and encourage new peering, and will often arrange social events for these purposes.

Private peering

Private peering is the direct interconnection between only two networks, across a Layer 1 or 2 media that offers dedicated capacity that is not shared by any other parties. Early in the history of the Internet, many private peers occurred across 'telco' provisioned SONET circuits between individual carrier-owned facilities. Today, most private interconnections occur at carrier hotels or carrier neutral colocation facilities, where a direct crossconnect can be provisioned between participants within the same building, usually for a much lower cost than telco circuits. Synchronous Optical Networking, commonly known as SONET, is a standard for communicating digital information over optical fiber. ... This article does not cite any references or sources. ...

Most of the traffic on the Internet, especially traffic between the largest networks, occurs via private peering. However, because of the resources required to provision each private peer, many networks are unwilling to provide private peering to "small" networks, or to "new" networks who have not yet proven that they will provide a mutual benefit.

Peering agreements/contracts

Throughout the history of the Internet, there have been a spectrum of kinds of agreements between peers, ranging from handshake deals to peering contracts which may be required by one or both sides. Such a contract sets forth the details of how traffic is to be exchanged, along with a list of expected activities which may be necessary to maintain the peering relationship, a list of activities which may be considered abusive and result in termination of the relationship, and details concerning how the relationship can be terminated. Detailed contracts of this type are typically used between the largest ISPs, and the ones operating in the most heavily-regulated economies, accounting for about 1-2% of peering relationships overall. A contract is a legally binding exchange of promises or agreement between parties that the law will enforce. ...

History of peering

The first Internet exchange point was the Metropolitan Area Ethernet, or MAE, in Tysons Corner, Virginia. When the United States government decided to de-fund the NSFNET backbone, Internet exchange points were needed to replace its function, and initial governmental funding was used to aid the MAE and bootstrap three other exchanges, which they dubbed NAPs, or "Network Access Points," in accordance with the terminology of the National Information Infrastructure document. All four are now defunct or no longer functioning as Internet exchange points: // An Internet exchange point (IX or IXP) is a physical infrastructure that allows different Internet Service Providers (ISPs) to exchange Internet traffic between their networks (autonomous systems) by means of mutual peering agreements, which allow traffic to be exchanged without cost. ... MAE-East is an eastern branch of The MCI Internet Exchange. ... Tysons Corner is an unincorporated place located in Fairfax County, Virginia, near Washington, D.C., and adjacent to McLean, Virginia. ... This article is about the U.S. state. ... National Science Foundation Network (NSFNet) was a major part of early 1990s Internet backbone. ...

• MAE-East - Located in Tysons Corner, VA, and later relocated to Ashburn, Virginia
• AADS - Located in Chicago, Illinois
• SprintNAP - Located in Pennsauken, New Jersey
• PacBell NAP - Distributed throughout California

As the Internet grew, and traffic levels increased, these NAPs became a network bottleneck. Most of the early NAPs utilized FDDI technology, which provided only 100 Mbit/s of capacity to each participant. Some of these exchanges upgraded to ATM technology, which provided OC-3 (155 Mbit/s) and OC-12 (622 Mbit/s) of capacity. MAE-East is an eastern branch of The MCI Internet Exchange. ... Tysons Corner is an unincorporated place located in Fairfax County, Virginia, near Washington, D.C., and adjacent to McLean, Virginia. ... In data networking and queueing theory, network congestion occurs when incremental increases in offered load lead either only to small increases in network throughput, or to an actual reduction in network throughput. ... In computer networking, fiber-distributed data interface (FDDI) is a standard for data transmission in a local area network that can extend in range up to 200 km (124 miles). ... A megabit per second (Mbps or Mbit/s or Mb/s) is a unit of data transmission equal to 1,024 kilobits per second or 1048576 bits per second. ... The introduction to this article provides insufficient context for those unfamiliar with the subject matter. ... Optical Carrier levels are used for the categories of bandwidth in a SONET fiber optic network. ... OC-12 (Optical Carrier 12) is a fiber optic network line with a SONET rate of 621. ...

Other prospective exchange point operators moved directly into offering Ethernet technology, such as gigabit Ethernet (1000 Mbit/s), which quickly became the predominant choice for Internet exchange points due to the reduced cost and increased capacity offered. Today, almost all significant exchange points operate solely over Ethernet, and most of the largest exchange points offer ten gigabit Ethernet (10,000 Mbit/s) service. Gigabit Ethernet (GbE) is a term describing various technologies for transmitting Ethernet packets at a rate of a gigabit per second, as defined by the IEEE 802. ...

During the dot-com boom, many exchange point and carrier neutral colocation providers had plans to build as many as 50 locations to promote carrier interconnection in the United States alone. Essentially all of these plans were abandoned following the dot-com bust, and today it is considered both economically and technically infeasible to support this level of interconnection among even the largest of networks. The dot-com bubble was a speculative bubble covering roughly 1995–2001 during which stock markets in Western nations saw their value increase rapidly from growth in the new Internet sector and related fields. ...

Depeering

By definition, peering is the voluntary and free exchange of traffic between two networks, for mutual benefit. If one or both networks believes that there is no longer a mutual benefit, they may decide to cease peering: this is known as depeering. Some of the reasons why one network may wish to depeer another include:

• A desire that the other network pay settlement, either in exchange for continued peering or for transit services.
• A belief that the other network is "profiting unduly" from the settlement free interconnection.
• Concern over traffic ratios, which related to the fair sharing of cost for the interconnection.
• A desire to peer with the upstream transit provider of the peered network.
• Abuse of the interconnection by the other party, such as pointing default or utilizing the peer for transit.
• Instability of the peered network, repeated routing leaks, lack of response to network abuse issues, etc.
• The inability or unwillingness of the peered network to provision additional capacity for peering.
• The belief that the peered network is unduly peering with your customers.
• Various external political factors (including personal conflicts between individuals at each network).

In some situations, networks who are being depeered have been known to attempt to fight to keep the peering by intentionally breaking the connectivity between the two networks when the peer is removed, either through a deliberate act or an act of omission. The goal is to force the depeering network to have so many customer complaints that they are willing to restore peering. Examples of this include forcing traffic via a path that does not have enough capacity to handle the load, or intentionally blocking alternate routes to or from the other network. Some very notable examples of these situations have included:

• BBN Planet vs. Exodus Communications^[1]
• PSINet vs. Cable & Wireless^[2]

• AOL Transit Data Network (ATDN) vs. Cogent Communications^[3]
• Teleglobe vs. Cogent Communications ^{[citation needed]}
• France Télécom vs. Cogent Communications^[4]
• France Télécom (Wanadoo) vs. Proxad (Free)^[5]
• Level 3 Communications vs. XO Communications ^{[citation needed]}
• Level 3 Communications vs. Cogent Communications^[6]
• Telecom/Telefonica/Impsat/Prima vs. CABASE (Argentina) ^[7]

BBN might refer to: Bolt, Beranek and Newman, (now known as BBN Technologies), a technology company in Cambridge, Massachusetts, best known for its work on packet switching technology Bible Broadcasting Network, a global Christian radio network headquartered in Charlotte, NC Big Bang nucleosynthesis Big Brother Nigeria, a reality show which... Exodus Communications was a high-flying internet hosting and service provider to dot-com businesses that went broke with their customers. ... PSINet was one of the first internet service providers (ISPs), and a major player in the commercialization of the Internet until the companys bankruptcy in 2001. ... Cable and Wireless (LSE: CW.) is a British telecommunications company. ... It has been suggested that AOL search data scandal be merged into this article or section. ... Cogent Communications is a multinational IP Internet Service Provider. ... VSNL International Canada (formerly called Teleglobe) is an international telco carrier. ... France Télécom (Euronext: FTE, NYSE: FTE) (often spelled France Telecom, without the accents, in non-French text) is the main telecommunication company in France. ... Not to be confused with L-3 Communications, a communications system company formed from the assets of the former Loral and Lockheed corporations before their merger. ... XO Holdings, Inc. ...

Modern peering

Peering locations

The examples and perspective in this article or section may not represent a worldwide view of the subject. Please improve this article or discuss the issue on the talk page.

The modern Internet operates with significantly more peering locations than at any time in the past, resulting in improved performance and better routing for the majority of the traffic on the Internet. However, in the interests of reducing costs and improving efficiency, most networks have attempted to standardize on relatively few locations within these individual regions where they will be able to quickly and efficiently interconnect with their peering partners. Image File history File links Gnome-globe. ...

The primary locations for peering within the United States are generally considered to be^{[citation needed]}:

• San Francisco Bay Region (San Jose CA, Palo Alto CA, Santa Clara CA, San Francisco CA)
• Washington DC / Northern Virginia Region (Washington, DC, Ashburn VA, Reston VA, Vienna VA)
• New York City Region (New York NY, Newark NJ)
• Chicago Region (Chicago IL)
• Los Angeles Region (Los Angeles, CA)
• Dallas Region (Dallas, TX, Plano, TX, Richardson, TX)

For international traffic, the most important locations for peering are generally considered to be^{[citation needed]}:

• Amsterdam, Netherlands
• London, United Kingdom
• Frankfurt, Germany
• Tokyo, Japan
• Hong Kong, China
• Seoul, South Korea
• Miami, FL, USA

Exchange points

The largest individual exchange points in the world are AMS-IX in Amsterdam, followed closely by LINX in London. The next largest exchange point is generally considered to be JPIX in Tokyo, Japan. The United States, with a historically larger focus on private peering and commercial public peering, has a much smaller amount of traffic on public peers compared to other regions which operate non-profit exchange points. The combined exchange points in multiple cities operated by Equinix are generally considered to be the largest and most important, followed by the PAIX facilities which are currently owned and operated by Switch and Data. Other important but smaller exchange points include LIPEX and LONAP in London UK, DE-CIX in Frankfurt Germany, NYIIX in New York, and Nap of the Americas (or NOTA) in Miami, Florida. The Amsterdam Internet Exchange (AMS-IX) is an Internet Exchange Point situated in Amsterdam, in the Netherlands. ... Telehouse Docklands, home of the London Internet Exchange since 1994. ... Equinix, Inc. ... PAIX initially stood for Palo Alto Internet Exchange, and was later remarketed as Peering And Internet eXchange, a service of Switch and Data. ... Switch and Data is North America’s leading neutral Internet communications interconnection and colocation service provider. ... London Network Access Point (LONAP) is a member-owned Internet exchange located in the London, UK. LONAP was founded in 1997 by a group of founder Internet Service Providers. ... This article or section does not adequately cite its references or sources. ...

URLs to some public traffic statistics of exchange points include:

• AMS-IX
• DE-CIX
• LINX
• MSK-IX
• TORIX
• NYIIX
• LAIIX
• TOP-IX
• Netnod

See also List of Internet Exchange Points by size This is a list of Internet Exchange Points by size (of overall throughput), with additional data on location, establishment and average throughput. ...

Peering and BGP

A great deal of the complexity in the BGP routing protocol exists to aid the enforcement and fine-tuning of peering and transit agreements. BGP allows operators to define a policy that determines where traffic is routed. Three things commonly used to determine routing are local-preference, multi exit discriminators (MEDs) and AS-Path. Local-preference is used internally within a network to differentiate classes of networks. For example, a particular network will have a higher preference set on internal and customer advertisements. Settlement free peering is then configured to be preferred over paid IP transit. The border gateway protocol (BGP) is one of the core routing protocols in the Internet. ... It has been suggested that this article or section be merged into Internet transit. ...

Networks that speak BGP to each other can engage in multi exit discriminator exchange with each other, although most do not. When networks interconnect in several locations, MEDs can be used to reference that network's interior gateway protocol cost. This results in both networks sharing the burden of transporting each others traffic on their own network (or cold potato). Hot-potato or nearest-exit routing, which is typically the normal behavior on the Internet, is where traffic destined to another network is delivered to the closest interconnection point. A set of routing protocols that are used within an autonomous system are referred to as interior gateway protocols (IGP). ... In the jargon of routing technology, hot-potato routing is routing that forwards the packet towards the path with the lowest delay (as opposed, for example, to the more commonly used metric of least number of hops). ... In the jargon of routing technology, hot-potato routing is routing that forwards the packet towards the path with the lowest delay (as opposed, for example, to the more commonly used metric of least number of hops). ...

Law and policy

Internet interconnection is not regulated in the same way that public telephone network interconnection is regulated. Nevertheless, Internet interconnection has been the subject of several areas of federal policy. Perhaps the most dramatic example of this is the attempted MCI / Sprint merger. In this case, the Department of Justice signaled that it would move to block the merger specifically because of the impact of the merger on the Internet backbone market. In 2001, the Federal Communications Commission's advisory committee, the Network Reliability and Interoperability Council recommended that Internet backbones publish their peering policies, something that they had been hesitant to do before hand. The FCC has also reviewed competition in the backbone market in its Section 706 proceedings which review whether advanced telecommunications are being provided to all Americans in a reasonable and timely manner. For other uses, see Telephone (disambiguation). ... MCI logo MCI, Inc. ... Sprint Nextel Corporation (NYSE: S) is one of the largest telecommunications companies in the world. ... The Robert F. Kennedy Department of Justice Building in Washington, D.C. “Justice Department” redirects here. ... The FCCs official seal. ... Telecommunication involves the transmission of signals over a distance for the purpose of communication. ...

Finally, Internet interconnection has become an issue in the international arena under something known as the International Charging Arrangements for Internet Services (ICAIS).^[8] In the ICAIS debate, countries underserved by Internet backbones have complained that it is unfair that they must pay the full cost of connecting to an Internet exchange point in a different country, frequently the United States. These advocates argue that Internet interconnection should work like international telephone interconnection, with each party paying half of the cost.^[9] Those who argue against ICAIS point out that much of the problem would be solved by building local exchange points. A significant amount of the traffic, it is argued, that is brought to the US and exchanged then leaves the US, using US exchange points as switching offices but not terminating in the US.^[10] In worst case scenarios, traffic from one side of a street is brought to Miami, exchanged, and then returned to another side of the street. Countries with liberalized telecommunications and open markets, where competition between backbone providers occurs, tend to oppose ICAIS.

See also

• Autonomous system
• Tier 1 network
• Internet Exchange Point
• Border Gateway Protocol (BGP)
• Default-free zone
• Interconnect agreement
• Internet traffic engineering
• Network Neutrality
• North American Network Operators' Group (NANOG)
• European Internet Exchange Association (Euro-IX)

In the Internet, an autonomous system (AS) is a collection of IP networks and routers under the control of one entity (or sometimes more) that presents a common routing policy to the Internet. ... A Tier 1 Network is an IP network (typically but not necessarily an Internet Service Provider) which connects to the entire Internet solely via Settlement Free Interconnection, commonly known as peering. ... // An Internet exchange point (IX or IXP) is a physical infrastructure that allows different Internet Service Providers (ISPs) to exchange Internet traffic between their networks (autonomous systems) by means of mutual peering agreements, which allow traffic to be exchanged without cost. ... The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. ... The Default-free zone refers simultaneously to both the collection of all Internet networks who do not use a defualt route and therefore have full BGP tables and the full BGP tables themselves. ... Interconnect agreements on the Internet are of typically two forms: Peering and IP Transit. ... Internet traffic engineering Internet traffic engineering refers to all the work related to the physical network (usually fiber optic cables, routers, exchanges) that carries Internet traffic between different networks with the objective of reaching the highest levels of capacity in the Internet backbone. ... Network neutrality (equivalently net neutrality, internet neutrality or NN) refers to a principle that is applied to residential broadband networks, and potentially to all networks. ... NANOG is the North American Network Operators Group, which runs meetings, talks, surveys and an influential mailing list for Internet service providers. ... Euro-IX or The European Internet Exchange Association formed in May 2001 with the intention to further develop, strengthen and improve the Internet Exchange Point community. ...

References

1. ^ Fusco, Patricia. "PSINet, Exodus Terminate Peering Agreement", InternetNews, 2000-05-04. Retrieved on 2006-09-28. 
2. ^ Burton, Graeme. "PSINet-C&W dispute causes Internet blackout", Information Age magazine, 2001-06-07. Retrieved on 2006-09-28. 
3. ^ Noguchi, Yuki. "'Peering' Dispute With AOL Slows Cogent Customer Access", Washington Post, 2002-12-27. Retrieved on 2006-09-28. 
4. ^ Kuri, Jürgen, Smith, Robert W.. "France Telecom severs all network links to competitor Cogent", Heise online, 2005-04-21. Retrieved on 2006-09-28. 
5. ^ Le Bouder, Gonéri. "Probleme de peering entre Free et France Télécom", LinuxFr, 2003-01-11. Retrieved on 2006-09-28. 
6. ^ Cowley, Stacey. "ISP spat blacks out Net connections", InfoWorld, 2005-10-06. Retrieved on 2006-09-28. 
7. ^ ""CABASE sale aireada del conflicto NAP"". 
8. ^ Internet Traffic Exchange and the Development of End to End International Telecommunication Competition, OECD 3/25/02
9. ^ ITU-T Recommendation D.50
10. ^ CAIDA: Internet Measurement: Myths about Internet data (5 dec 01)

Year 2000 (MM) was a leap year starting on Saturday (link will display full 2000 Gregorian calendar). ... is the 124th day of the year (125th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 271st day of the year (272nd in leap years) in the Gregorian calendar. ... Year 2001 (MMI) was a common year starting on Monday (link displays the 2001 Gregorian calendar). ... June 7 is the 158th day of the year in the Gregorian calendar (159th in leap years), with 207 days remaining. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 271st day of the year (272nd in leap years) in the Gregorian calendar. ... ... Also see: 2002 (number). ... December 27 is the 361st day of the year in the Gregorian calendar (362nd in leap years). ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 271st day of the year (272nd in leap years) in the Gregorian calendar. ... Heinz Heise is a German publishing house. ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... is the 111th day of the year (112th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 271st day of the year (272nd in leap years) in the Gregorian calendar. ... Linuxfr is a Slashdot-like, French-speaking technology website. ... Year 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... is the 11th day of the year in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 271st day of the year (272nd in leap years) in the Gregorian calendar. ... InfoWorld is an information technology online media and events business operating under the umbrella of InfoWorld Media Group, a division of IDG (International Data Group). ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... is the 279th day of the year (280th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 271st day of the year (272nd in leap years) in the Gregorian calendar. ...

External links

• PeeringDB: A free database of peering locations and participants
• Example Tier 1 Peering Requirements: AT&T (AS7018)
• Example Tier 1 Peering Requirements: MCI (AS701/AS702/AS703)
• Example Tier 1 Peering Requirements: AOL Transit Data Network (AS1668)
• Cybertelecom :: Backbones - Federal Internet Law and Policy

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