A、synchronizes FIFO， PQ， CQ， and MDRR， with WFQ， CBWFQ， and LLQ

B、enables strict priority queuing for voice traffic， and weighted round robin queuing for data traffic

C、enables low latency queuing to ensure that voice traffic receives priority treatment

D、enforces a trust boundary on switch access ports and uplinks/downlinks 

E、modifies queue sizes as well as queue weights where required 

F、adjusts link speeds to adapt to QoS needs