Which two actions are performed by the Weighted Random Early Detection mechanism? (Choose two)
A . It drops lower-priority packets before it drops higher-priority packets
B . It can identify different flows with a high level of granularity
C . It guarantees the delivery of high-priority packets
D . It can mitigate congestion by preventing the queue from filling up
E . It supports protocol discovery
Answer: A D
Explanation:
Weighted Random Early Detection (WRED) is just a congestion avoidance mechanism. WRED drops packets selectively based on IP precedence. Edge routers assign IP precedences to packets as they enter the network.
When a packet arrives, the following events occur: