The 802.11 Data-Link layer is divided into two sublayers
- Logical Link Control (LLC) sublayer
- Media Access Control (MAC) sublayer
When Network Layer sends data to Data-Link layer, the data is handed off to the LLC and becomes known as the MAC Service Data Unit (MSDU). When LLC sends the MSDC to the MAC layer. Then MSDU is now encapsulated in a MAC Protocal Data Unit (MPDU)
Above two pictures are from CWAP
Let see the real wireless data from wireless packet capture.
The data from 88 to 00 (mark as the blue color) is MAC header and the data from 79 to 65 is FCS. The rest of parts (from aa to 65) is Fame body.
No comments:
Post a Comment