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Radio Tap Header shows Aggregation information though - so I think C should be correct.
Kili - Feb 04, 2021
No.# A is correct - management frames (including Assoc Resp) are only sent from AP to STA. So no DS (ethernet traffic from LAN) is involved. TO and FROM stays 0 in this case.
Also this document shows that LLC + Data is being framed at the MAC layer - so LLC (which is upwards) and all data is framed into an MSDU which is encrypted. But MAC Header + Trailer are added (and it becomes an MPDU). https://mrncciew.com/2014/08/16/decrypt-wpa2-psk-using-wireshark/
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No.# D is wrong.
In HT Control Field is no "A-MPDU flag" as shown here:
https://mrncciew.com/2014/10/20/cwap-ht-control-field/
Radio Tap Header shows Aggregation information though - so I think C should be correct.
No.# A is correct - management frames (including Assoc Resp) are only sent from AP to STA. So no DS (ethernet traffic from LAN) is involved. TO and FROM stays 0 in this case.
No.# It should be B:
Slide 32 does show it is only the frame body and LLC. Header is cleartext.
https://ieee802.org/16/liaison/docs/80211-05_0123r1.pdf
Also this document shows that LLC + Data is being framed at the MAC layer - so LLC (which is upwards) and all data is framed into an MSDU which is encrypted. But MAC Header + Trailer are added (and it becomes an MPDU).
https://mrncciew.com/2014/08/16/decrypt-wpa2-psk-using-wireshark/
This also shows that encryption happens at MAC layer so MAC header is cleartext.
https://serverfault.com/questions/587406/which-layer-of-the-osi-model-is-responsible-for-encryption-in-wlans
No.# this should be B response is coming from the DS