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redes de area amplia

REDES DE ÁREA AMLIA (WAN)

Cuando se llega a un cierto punto, deja de ser poco práctico seguir ampliando una LAN. A veces esto viene impuesto por limitaciones físicas, aunque suele haber formas más adecuadas o económicas de ampliar una red de computadoras. Dos de los componentes importantes de cualquier red son la red de teléfono y la de datos. Son enlaces para grandes distancias que amplían la LAN hasta convertirla en una red de área amplia (WAN). Casi todos los operadores de redes nacionales (como DBP en Alemania, British Telecom en Inglaterra o la Telefónica en España) ofrecen servicios para interconectar redes de computadoras, que van desde los enlaces de datos sencillos y a baja velocidad que funcionan basándose en la red pública de telefonía hasta los complejos servicios de alta velocidad (como frame relay y SMDS-Synchronous Multimegabit Data Service) adecuados para la interconexión de las LAN. Estos servicios de datos a alta velocidad se suelen denominar conexiones de banda ancha. Se prevé que proporcionen los enlaces necesarios entre LAN para hacer posible lo que han dado en llamarse autopistas de la información.

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