what is the difference between layer 2 and layer 3 qos

Answer Posted / harsha

L2 QoS is called as CoS (class of service) .
It deals with VLan mapping .Actually in dot1q , u will have
Priority bits (3 bits-2 to the power 3=8 nos).

QoS (called Quality of Service) deals with IP pkt, which
needs to deal with IP headers (ToS).ip precedence bits/dscp
etc.

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