Exam 400-007 topic 1 question 139 discussion

Actual exam question from Cisco's 400-007

Question #: 139
Topic #: 1

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

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

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Suggested Answer: B 🗳️

by J_W at June 2, 2023, 10:22 a.m.

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J_W

6 months ago

Selected Answer: B

weighted random early detection (WRED) can be used to implement a congestion avoidance technique for TCP-based applications. WRED allows the router to selectively drop packets when the congestion level exceeds a certain threshold. By dropping packets early in the queue, before the queue becomes full, it helps to prevent tail drops and reduce congestion. WRED uses probabilistic dropping based on the IP Precedence or Differentiated Services Code Point (DSCP) values of the packets to prioritize and protect important traffic while allowing less important traffic to be dropped.

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