Wide-area network
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| Wide-area network | |
|---|---|
| Name | Wide-area network |
| Type | Telecommunications network |
| Area | International, continental |
| Owner | Various carriers and enterprises |
Wide-area network A wide-area network (WAN) connects geographically dispersed telecommunications networks, linking metro networks, local area networks, and campus networks across cities, countries, and continents. WANs enable long-distance data exchange between organizations such as AT&T, Verizon Communications, BT Group, and NTT Communications, and underpin services used by institutions like United Nations, World Bank, and European Union. Modern WANs integrate technologies developed by standards bodies such as the Institute of Electrical and Electronics Engineers and the Internet Engineering Task Force, and are central to infrastructures operated by carriers including Deutsche Telekom and China Telecom.
Overview
WANs provide connectivity over wide geographic areas for entities such as University of California, Berkeley, Boeing, Goldman Sachs, and Walmart. Architecturally they span physical links provisioned by companies such as Cisco Systems and Juniper Networks and rely on protocols standardized by the International Telecommunication Union and the Internet Society. WAN topologies range from point-to-point leased circuits used by Bank of America to mesh overlays employed in deployments by Amazon (company) and Microsoft. Services delivered over WANs include virtual private networks for United States Department of Defense contractors and content delivery for media companies like Netflix.
Technologies and Architectures
WAN implementations combine optical transport such as dense wavelength-division multiplexing deployed by carriers like Orange S.A. with packet technologies like Multiprotocol Label Switching used by Sprint Corporation and T-Mobile. Routing and forwarding are managed by protocols including Border Gateway Protocol, Open Shortest Path First, and Routing Information Protocol in equipment sold by Huawei Technologies and Arista Networks. Overlay architectures employ Virtual Extensible LAN and Generic Routing Encapsulation for tenant isolation in cloud providers such as Google LLC and Oracle Corporation. Edge connectivity uses methods like xDSL and fiber to the home provided by regional operators such as Rogers Communications and Telstra.
Performance and Scalability
WAN performance metrics—bandwidth, latency, jitter, and packet loss—are crucial for applications run by Citigroup, Facebook, and Adobe Inc.. Traffic engineering techniques including Quality of Service and traffic shaping optimize paths across backbones operated by Level 3 Communications and Cogent Communications. Scalability is addressed via approaches such as network function virtualization adopted by Deutsche Bank and HSBC, and software-defined WAN frameworks promoted by vendors like VMware, Inc. and Silver Peak. Content distribution leverages strategic points-of-presence maintained by Akamai Technologies and Cloudflare to reduce round-trip time for global audiences.
Management and Security
WAN management employs telemetry standards from the IETF and orchestration platforms by companies like Cisco Systems and Juniper Networks; enterprises such as Siemens and General Electric deploy automation for provisioning. Security uses cryptographic controls—IPsec and TLS—aligned with guidance from National Institute of Standards and Technology and enforced through appliances by Palo Alto Networks and Fortinet. Identity and access solutions from Okta, Inc. and Microsoft Azure Active Directory integrate with WAN gateways for zero-trust models used by agencies like NSA and corporations such as Lockheed Martin. Incident response and forensics often involve collaboration with firms like Mandiant and regulatory bodies such as the European Commission.
Applications and Use Cases
WANs support cloud interconnectivity for providers including Amazon Web Services, Microsoft Azure, and Google Cloud Platform, enabling hybrid architectures for organizations like Procter & Gamble and ExxonMobil. Financial services rely on low-latency links between exchanges such as New York Stock Exchange and London Stock Exchange, while media companies stream via infrastructures used by BBC and Disney. Critical communications for disaster response coordinate among entities like Red Cross and World Health Organization, and research collaborations such as CERN and Square Kilometre Array use dedicated research and education backbones.
History and Evolution
Early WAN concepts trace to packet-switched networks like ARPANET and commercial developments by British Telecom and Sprint Corporation. The proliferation of fiber optics followed breakthroughs by researchers associated with Bell Labs and deployments by AT&T and NTT Communications. The advent of the public Internet combined with MPLS and VPN innovations from vendors such as Cisco Systems reshaped enterprise WAN strategies. Recent shifts toward software-defined paradigms are driven by initiatives from companies like VMware, Inc. and Cisco Systems, and by open-source projects sponsored by organizations including the Linux Foundation and Open Networking Foundation.