A.FIFO queuing， which provides a means to hold packets while they are waiting to exit an interface
B.Priority queuing， which ensures a fixed amount of bandwidth
C.Custom queuing （CO）， which provides a queuing tool that services all queues， even during times of congestion
D.Bandwidth queuing， which ensures a minimum amount of bandwidth
E.Weighted fair queuing （WFO）， which classifies packets based on flows

A.World Wide Web traffic using load balanced web servers
B.voice
C.peer to peer applications mission critical applications
D.peer to peer applications
E.multicast routing protocols