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Layers 1-2 : Physical-Datalink |
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Écrit par CCNA
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26-05-2008 |
- 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).
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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 :
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Dernière mise à jour : ( 31-05-2008 )
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Cisco CCNA (English)