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Where is priority for a particular frame set?

From the Catalyst 4000 documentation: ISL or 802.1Q frames are not classified or marked at the ingress port; the existing CoS value is honored. When an 802.1Q frame enters the switch through a ...
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Where is priority for a particular frame set?

Edited: Where is the priority level for a particular frame set? (whose code decides and in what device) Since the MAC layer does not inspect the contents of a packet, how does the MAC layer know what ...
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Mechanism/purpose of the NAV and its relation to the exposed node problem in 802.11

I found the answer here IEEE 802.11 MAC Dictionary here is the relevant section NAV (Virtual carrier sense) It is interesting that the RTS set its NAV covering to the end of whole RTS-CTS-DATA-ACK ...
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