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what is the Difference between Router QoS and Switch QoS?
That depends on the devices being compared. Generally, router QoS offers many more QoS configuration options.
when we need Router QoS and when we need Switch QoS?
One doesn't depend on the other. Both depend on whether there's congestion that's adverse to the service needs of the traffic (and whether QoS can meet those needs).
if I have VOIP QoS on router, then do i need VOIP QoS on Switch?
Ditto to prior question and answer.
