300-415 Question 252
Single answerYou are configuring a Cisco SD-WAN policy to dynamically schedule traffic based on network conditions. The goal is to ensure that critical traffic, such as VoIP, always receives the highest priority and is transmitted over the best available path. Which scheduling method should you use to achieve this, while also meeting the requirement to minimize packet loss and latency?
- A
Low Latency Queuing (LLQ)
- B
Weighted Round Robin (WRR)
- C
Traffic Shaping
- D
Priority Queuing (PQ)
Show answer and explanation
Correct answer: A
Explanation
Low Latency Queuing (LLQ) is the best option for scheduling in this scenario as it combines strict priority for critical traffic with mechanisms to handle other traffic types fairly. This ensures VoIP and other sensitive traffic types are prioritized while avoiding packet loss and latency issues.
- A. Correct.
Low Latency Queuing (LLQ) is the correct method as it ensures strict priority scheduling for critical traffic like VoIP while minimizing latency and packet loss. LLQ also allows other traffic types to be handled appropriately.
- B. Incorrect.
Weighted Round Robin (WRR) is used for balancing bandwidth among multiple traffic types but does not guarantee the strict priority needed for critical traffic like VoIP.
- C. Incorrect.
Traffic Shaping is used to control the traffic rate to avoid congestion but does not prioritize specific traffic types in real-time.
- D. Incorrect.
Priority Queuing (PQ) provides strict priority for traffic but can lead to starvation of lower-priority traffic, making it unsuitable for a balanced SD-WAN deployment.