Selected Answer: C There are two classes of WFQ sessions: high bandwidth and low bandwidth. Low-bandwidth traffic has effective priority over high-bandwidth traffic, and high-bandwidth traffic shares the transmission service proportionally according to assigned weights. When WFQ is enabled on an interface, new messages for high-bandwidth traffic streams are dropped after the configured or default congestive messages threshold has been reached. However, low-bandwidth conversations, which include control message conversations, continue to enqueue data. With standard WFQ, packets are classified by flow. Packets with the same source IP address, destination IP address, source TCP or User Datagram Protocol (UDP) port, or destination TCP or UDP port belong to the same flow. WFQ assigns an equal share of the bandwidth to each flow. Flow-based WFQ is also known as fair queueing because all flows are equally weighted. https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/qos_conmgt/configuration/15-mt/qos-conmgt-15-mt-book/qos-conmgt-cfg-wfq.html.xml#GUID-E0AB57ED-E7F8-4F2D-8F2D-FEC30D4E23B6

my answer D WFQ gives traffic priority handling that automatically organizes individual traffic streams without needing you to first set up access lists. WFQ can also handle duplex data streams such as those between pairs of applications, and simplex data streams such as voice or video. There are two classes of WFQ sessions: high bandwidth and low bandwidth. Low-bandwidth traffic has effective priority over high-bandwidth traffic, and high-bandwidth traffic shares the transmission service proportionally based on assigned weights.