Additional criterion used by WRED

What is the additional criterion used by WRED and not by RED to improve processing of VolP traffic? Use credible Internet resources of your choice as well as the study materials to address the following: Describe QoS queuing and buffering techniques, such as weighted fair queuing (WFQ), class-based weighted fair queuing (CBWFQ), and weighted random early detection (WRED). Explain QoS traffic shaping. Describe Layer 3 QoS concepts, such as ToS, CoS, and DiffServ. Describe the functionality and interoperability of QoS using RSVP and MPLS.