300-415 Question 263
Single answerAn enterprise network is using Cisco SD-WAN. The network administrator has implemented traffic shaping policies to ensure critical applications have sufficient bandwidth during congestion. However, users report poor voice and video quality during peak hours. Upon investigation, it is found that excessive queuing delays are occurring. What could be the most effective adjustment to the current shaping policy to resolve this issue?
- A
Increase the priority of voice and video traffic within the shaping policy.
- B
Decrease the shaping rate for all traffic to ensure fair bandwidth distribution.
- C
Implement low-latency queuing (LLQ) for voice and video traffic within the shaping policy.
- D
Disable shaping for the entire network and rely on the default SD-WAN routing policies.
Show answer and explanation
Correct answer: C
Explanation
Shaping policies in Cisco SD-WAN are designed to control traffic rates and manage congestion. However, shaping can introduce queuing delays, which impact real-time applications like voice and video. Low-latency queuing (LLQ) ensures that delay-sensitive traffic is prioritized within the shaping policy, minimizing delays and improving quality during peak usage.
- A. Incorrect.
Increasing the priority of voice and video traffic may help in prioritizing these applications, but it will not directly address the queuing delays caused by shaping.
- B. Incorrect.
Decreasing the shaping rate for all traffic could worsen the problem by creating more congestion and increasing queuing delays.
- C. Correct.
Implementing low-latency queuing (LLQ) is the correct approach since it ensures that voice and video traffic are treated with the highest priority and experience minimal delay, even under congestion.
- D. Incorrect.
Disabling shaping entirely is not recommended since shaping helps manage bandwidth and prevent overuse, and relying solely on SD-WAN routing policies could lead to unpredictable performance.