300-445 Question 131
Single answerAn enterprise network is experiencing intermittent voice call quality issues, including dropped calls and choppy audio. The network administrator suspects a misconfiguration in the Quality of Service (QoS) settings for voice traffic. Which QoS configuration is MOST critical to ensure high-quality voice communication in the network?
- A
Configuring low latency queuing (LLQ) for voice traffic and ensuring it has the highest priority
- B
Setting the voice traffic to the 'Best Effort' service class to avoid excessive bandwidth usage
- C
Enabling Weighted Fair Queuing (WFQ) for voice traffic prioritization
- D
Increasing the MTU size for voice traffic packets to maximize bandwidth utilization
Show answer and explanation
Correct answer: A
Explanation
Voice traffic is highly sensitive to latency, jitter, and packet loss. Configuring Low Latency Queuing (LLQ) ensures that voice traffic is prioritized above other types of traffic in the network, providing the low latency and consistent performance required for high-quality voice communication. Other configurations, such as 'Best Effort,' WFQ, or increasing MTU size, do not address the specific needs of voice traffic effectively.
- A. Correct.
Low latency queuing (LLQ) is a critical QoS configuration for voice traffic, as it ensures low-delay, high-priority handling of voice packets, minimizing jitter and latency.
- B. Incorrect.
The 'Best Effort' service class does not provide any prioritization or guarantees for voice traffic, which can result in poor call quality under network congestion.
- C. Incorrect.
While Weighted Fair Queuing (WFQ) is useful for general traffic prioritization, it does not provide the strict priority needed for sensitive voice traffic.
- D. Incorrect.
Increasing the MTU size for voice traffic is not relevant to QoS and can potentially cause fragmentation issues, negatively impacting call quality.