300-420 · Question #53
Which QoS feature responds to network congestion by dropping lower priority packets?
The correct answer is C. WRED. WRED (Weighted Random Early Detection) is a congestion avoidance mechanism that begins dropping packets before the queue is completely full. It uses IP Precedence or DSCP markings to assign drop probabilities - lower-priority packets have a higher probability of being dropped…
Question
Which QoS feature responds to network congestion by dropping lower priority packets?
Options
- ACBWFQ
- Btail drop
- CWRED
- Dstrict priority
How the community answered
(56 responses)- A9% (5)
- B2% (1)
- C86% (48)
- D4% (2)
Explanation
WRED (Weighted Random Early Detection) is a congestion avoidance mechanism that begins dropping packets before the queue is completely full. It uses IP Precedence or DSCP markings to assign drop probabilities - lower-priority packets have a higher probability of being dropped earlier, while higher-priority packets are protected. This prevents global synchronization of TCP flows and preferentially protects high-priority traffic. Tail drop (B) drops all packets equally once the queue is full, without regard to priority. CBWFQ (A) guarantees minimum bandwidth per class but does not selectively drop lower-priority packets. Strict priority (D) ensures high-priority traffic is always sent first but does not itself drop lower-priority packets based on congestion.
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