300-415 Question 278
Single answerAn enterprise has deployed Cisco SD-WAN and configured Application Quality of Experience (App-QoE) to improve application performance. During a network review, the IT team notices that VoIP calls are experiencing high jitter and delay. Which feature of App-QoE can be utilized to address this issue?
- A
Forward Error Correction (FEC)
- B
Application-aware routing (AAR)
- C
TCP Optimization
- D
Packet Duplication
Show answer and explanation
Correct answer: D
Explanation
Packet Duplication is a feature within Cisco SD-WAN's App-QoE that sends duplicate packets over multiple paths. By doing this, it mitigates the effects of jitter and delay by ensuring that at least one copy of the packet reaches the destination with minimal latency. This makes it an appropriate solution for real-time applications like VoIP.
- A. Incorrect.
Forward Error Correction (FEC) is used to recover lost packets by adding redundancy, but it is more useful in scenarios with packet loss rather than jitter or delay.
- B. Incorrect.
Application-aware routing (AAR) helps in selecting the best path for applications based on SLA metrics, but it does not directly address jitter and delay within a single path.
- C. Incorrect.
TCP Optimization enhances TCP performance for applications using TCP, but VoIP typically uses UDP, so this would not address jitter or delay for VoIP traffic.
- D. Correct.
Packet Duplication sends multiple copies of packets over different paths to minimize the impact of jitter and delay, making it suitable for resolving VoIP performance issues.