Layers 1-2 : Physical-Datalink
Écrit par CCNA   
  • The Physical Layer (Layer 1) is in charge of transmitting data through :
    • a medium (cable, wireless)
    • a technique (baseband, broadband)
    • a mode (half or full duplex).
  • The Datalink Layer (Layer 2), which works on MAC addresses, is in charge of synchronizing, detecting errors but not repairing (FCS - Frame Check sequence through parity bit) and identifying the packets coming from different operating systems (LLC - Logical Link Control). A frame is built as follows :
    Datalink frame
Dernière mise à jour : ( 31-05-2008 )