Question: what is the difference between layer 2 and layer 3 qos?
Answer: QoS supports the use of either value because DSCP values are backward-compatible with IP precedence values. IP precedence values range from 0 to 7. Both IPP and DSCP use the bits in the ToS (Type of Service) byte in the IPv4 header. ... So, remember: layer-2 QoS deals with CoS, while at layer-3 we deal with IPP and|orDSCP.