Dirección MAC
En redes de computadoras la dirección MAC (Media Access Control address) es un identificador hexadecimal de 48 bits que se corresponde de forma única con una tarjeta o interfaz de red. Es individual, cada dispositivo tiene su propia dirección MAC determinada y configurada por el IEEE (los primeros 24 bits) y el fabricante (los ultimos 24 bits) utilizando el OUI. La mayoría de los protocolos que trabajan en la capa 2 del modelo OSI usan una de las tres numeraciones manejadas por el IEEE: MAC-48, EUI-48, y EUI-64 las cuales han sido diseñadas para ser identificadores globalmente únicos. No todos los protocolos de comunicación usan direcciones MAC, y no todos los protocolos requieren identificadores globalmente únicos.
La dirección MAC es utilizada en varias tecnologías entre las que se incluyen:
Ethernet
802.5 o redes en anillo a 4 Mbps o 16 Mbps Token Ring
802.11 redes inalámbricas (WIFI).
ATM
MAC opera en la capa 2 del modelo OSI, encargada de hacer fluir la información libre de errores entre dos máquinas conectadas directamente. Para ello se generan tramas, pequeños bloques de información que contienen en su cabecera las direcciones MAC correspondiente al emisor y receptor de la información.
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Cierto, todos estos temas tecnologicos a veces se ven dificilisimos, pero como se explico en la entrad tuya parece mas facil
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