300-445 Question 134
Select 3An enterprise network is experiencing frequent voice quality issues during VoIP calls, including jitter and packet loss. As the network engineer, you are tasked with implementing a solution to ensure stable voice communication. Which of the following actions should you take to address the issue?
- A
Enable QoS (Quality of Service) and prioritize voice traffic using DSCP (Differentiated Services Code Point) values.
- B
Increase the MTU size on all network devices to reduce packet fragmentation for voice traffic.
- C
Implement LLQ (Low-Latency Queuing) to guarantee bandwidth for voice traffic during congestion.
- D
Enable link aggregation on all switch ports to increase overall bandwidth availability for voice traffic.
- E
Configure jitter buffers on VoIP endpoints to mitigate jitter effects.
Show answer and explanation
Correct answers: A, C, E
Explanation
Voice traffic is highly sensitive to delay, jitter, and packet loss. To ensure optimal voice quality, it is crucial to prioritize voice packets using QoS mechanisms, implement LLQ for guaranteed bandwidth during congestion, and configure jitter buffers to handle variations in packet arrival times. These actions directly address the root causes of voice quality issues in enterprise networks.
- A. Correct.
Correct. Enabling QoS and prioritizing voice traffic ensures that voice packets are transmitted with higher priority, reducing the likelihood of packet loss and delay.
- B. Incorrect.
Incorrect. Increasing the MTU size does not address voice quality issues directly and can potentially introduce other problems if devices do not support larger MTU sizes.
- C. Correct.
Correct. LLQ provides a dedicated queue for voice traffic, ensuring that it is transmitted with minimal delay even during network congestion.
- D. Incorrect.
Incorrect. While link aggregation increases overall bandwidth, it does not directly address jitter or prioritize voice traffic, which are critical for VoIP quality.
- E. Correct.
Correct. Jitter buffers help compensate for packet arrival variations, reducing the impact of jitter on call quality.