200-301 Question 388
Select 3A network administrator is troubleshooting voice traffic issues on a congested network. The voice traffic is experiencing high latency and jitter. The administrator decides to implement QoS techniques. Which of the following actions are most appropriate to manage the network traffic effectively under congestion?
- A
Implement Weighted Fair Queuing (WFQ) to prioritize voice traffic.
- B
Apply traffic shaping to smooth traffic flow and limit bursts.
- C
Use policing to drop traffic that exceeds the bandwidth limit.
- D
Configure Low Latency Queuing (LLQ) to give strict priority to voice traffic.
- E
Disable queuing mechanisms to ensure all traffic is treated equally.
Show answer and explanation
Correct answers: A, B, D
Explanation
Managing voice traffic in a congested network requires techniques that prioritize delay-sensitive traffic while smoothing out bursts. WFQ and LLQ are effective queuing mechanisms that prioritize voice traffic. Traffic shaping helps manage congestion by smoothing the flow of traffic, whereas policing is not suitable as it can cause packet drops, increasing latency and jitter. Disabling queuing mechanisms would lead to poor performance for time-sensitive applications like voice.
- A. Correct.
Weighted Fair Queuing (WFQ) is a queuing mechanism that can prioritize traffic based on weight, making it suitable for handling voice traffic effectively in a congested network.
- B. Correct.
Traffic shaping helps regulate traffic flow and reduces bursts, which can mitigate congestion and improve voice traffic quality by smoothing out packet delivery.
- C. Incorrect.
Policing enforces strict bandwidth limits by dropping excess traffic, which can negatively impact voice traffic and increase latency and jitter.
- D. Correct.
Low Latency Queuing (LLQ) ensures that critical traffic like voice receives strict priority, reducing latency and improving performance for delay-sensitive applications.
- E. Incorrect.
Disabling queuing mechanisms would treat all traffic equally, which is not desirable for voice traffic that requires strict prioritization to avoid latency and jitter.