400-007: Cisco Certified Design ExpertDemo

Question

You are designing a QoS policy for a company that runs many TCP-based applications. The company is experiencing tail drops for these applications and wants to use a congestion-avoidance technique. Which QoS strategy can fulfill this requirement?

A weighted fair queuing
B weighted random early detection
C first-in first-out
D low-latency queuing

Explanation

Weighted Random Early Detection (WRED) performs probabilistic early packet drops as queue depth increases, signaling TCP senders to reduce their transmission rates before the queue becomes full. This avoids the queue-overflow tail drops associated with TCP traffic.

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Cisco QoS: Configuring Weighted Random Early Detection

400-007: Cisco Certified Design ExpertDemo

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Notes

Readiness

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