Tuesday, February 14, 2012

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Nivelul Legătură Date

March 11, 2009 Written by nicolae

Servicii: livrare sigură a unui pachet de legătură date între două maşini conectate fizic

Două tipuri de legături: punct-la-punct, difuzare

Tipuri de legături

Legături punct-la-punct: un expeditor, un destinatar

  • cadru: recunoaşterea biţilor pe fir ca pachete

  • comunicaţii sigure

Legături de difuzare: mai mulţi expeditori, mai mulţi destinatari potenţiali

  • încadrare

  • comunicaţii sigure

  • accesarea unui mediu partajat

  • adresare

Multe probleme de la nivele superioare apar şi aici.

  • comunicaţii sigure: ARQ, verificarea sumei, timere, numere secvenţiale

  • adresare

    • adresele nivelului legătură date sunt diferite de cele ale nivelului reţea!

Adresele nivelului legătură date 

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