300-415 Question 291
Select 3An enterprise has implemented Cisco SD-WAN to ensure reliable connectivity for critical applications between two branch offices. The IT team has enabled packet duplication to improve application performance and resiliency for a specific traffic flow. Which of the following statements accurately describes the behavior and implications of enabling packet duplication in this scenario?
- A
Packet duplication sends identical copies of data packets over multiple WAN links to ensure delivery in case of packet loss.
- B
Enabling packet duplication increases bandwidth consumption across the SD-WAN network.
- C
Packet duplication is automatically enabled for all traffic flows across the SD-WAN fabric when redundancy is required.
- D
The receiving SD-WAN edge router deduplicates packets to prevent duplicate data from being processed by the application.
- E
Packet duplication is most effective for non-critical traffic to improve throughput and reduce latency.
Show answer and explanation
Correct answers: A, B, D
Explanation
Packet duplication is a feature in Cisco SD-WAN that improves reliability for critical application traffic by sending identical packets over multiple WAN links. While it enhances delivery guarantees by mitigating packet loss, it also increases bandwidth consumption due to the duplicate transmissions. The receiving SD-WAN edge router ensures duplicate packets are removed before reaching the application to maintain data integrity. This feature is usually implemented for specific critical traffic flows rather than all traffic.
- A. Correct.
Correct: Packet duplication sends duplicate copies of packets over multiple WAN links to mitigate packet loss and ensure reliable delivery for critical traffic.
- B. Correct.
Correct: Since duplicate packets are sent over multiple paths, it naturally increases bandwidth consumption across the network.
- C. Incorrect.
Incorrect: Packet duplication is not automatically enabled for all traffic flows. It must be configured for specific critical applications or flows.
- D. Correct.
Correct: The receiving SD-WAN edge router uses deduplication mechanisms to remove duplicate packets, ensuring only unique packets are processed by the application.
- E. Incorrect.
Incorrect: Packet duplication is typically reserved for critical traffic, not non-critical traffic, as it prioritizes reliability and delivery over bandwidth efficiency.