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 （CQ）， 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 （WFQ）， which classifies packets based on flows