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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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How does Network Layer behave when client received a unicast DHCP offer?

A host might not be able to accept a unicast DHCP offer when it doesn't have an address configured. If so it shouldn't claim that it can: A client that cannot receive unicast IP datagrams until its ...
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