The two actions performed by the Weighted Random Early Detection (WRED) mechanism are:
D. It can mitigate congestion by preventing the queue from filling up.
E. It drops lower-priority packets before it drops higher-priority packets.
I also think the answer is DE.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/xe-16/qos-conavd-xe-16-book/qos-conavd-time-wred.html
"WRED is a congestion avoidance mechanism. WRED combines the capabilities of the Random Early Detection (RED) algorithm with the IP precedence feature to provide for preferential traffic handling of higher priority packets. WRED can selectively discard lower priority traffic when the interface begins to get congested and provide differentiated performance characteristics for different classes of service."
This answer is wrong. The answer should be B and D. WRED guarantees the delivery of high priority packets and it ensures there is no congestion. If there are no high priority packets and congestion, there will be no need for QoS.
Ebenezer. Your right however the question stats actions performed thus D and E are higher priority answers compared to B.
upvoted 2 times
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