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Definition of "Wide Area Network Switch" |
Wide area network switch, or WANs, connect a geographically diverse group of computers within a state, country, or even across several states or countries. WANs typically are connected by telephone lines, other types of communication lines, or radio waves. Quite often, smaller local area networks (LANs) are linked together to form a WAN. This is accomplished via dedicated private lines, leased from telecommunications firms like Sprint and AT&T, or by Switched Multi-Megabit Data Services (SMDS) technology, developed in 1995 to eliminate the need for a leased line.WAN technology has been refined over a period of several decades. It first emerged in the mid-twentieth century with the advent of networks like ARPAnet. Developed in 1969 by the Department of Defense, ARPAnet and several other networks eventually evolved into the Internet, the largest WAN in the world. The packet switching technology most commonly used with WANs surfaced in the 1960s, and standard packet switching protocol, known as X.25, was developed in 1976. |
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