Designing Cisco Enterprise Networks (ENSLD) — Question 24

Which QoS feature responds to network congestion by dropping lower priority packets?

Answer options

• A. CBWFQ
• B. tail drop
• C. WRED
• D. strict priority

Correct answer: C

Explanation

WRED (Weighted Random Early Detection) is a QoS feature that proactively drops lower priority packets during times of congestion to manage network traffic efficiently. In contrast, CBWFQ (Class-Based Weighted Fair Queuing) and strict priority do not drop packets based on priority in response to congestion, while tail drop simply removes packets from the queue without considering their priority.