300-415 Question 290
Select 3A company is experiencing significant packet loss on one of its WAN links due to intermittent network issues. To ensure critical application traffic is delivered reliably, the company decides to enable packet duplication on its Cisco SD-WAN solution. Which of the following statements accurately describe the behavior or considerations of packet duplication in this scenario?
- A
Packet duplication sends copies of the same packet over multiple WAN links to increase delivery reliability.
- B
Enabling packet duplication can increase the overall bandwidth utilization on the WAN links.
- C
Packet duplication is automatically enabled for all applications once configured on a Cisco SD-WAN policy.
- D
Packet duplication is most effective for applications that are latency-sensitive and require minimal packet loss.
- E
Packet duplication should only be enabled on WAN links with high bandwidth to avoid congestion.
Show answer and explanation
Correct answers: A, B, D
Explanation
Packet duplication is a feature in Cisco SD-WAN that enhances the reliability of packet delivery by sending duplicate packets over multiple WAN links. It is typically configured for critical applications that are latency-sensitive and cannot tolerate packet loss. However, enabling this feature increases bandwidth consumption as duplicate packets are transmitted. It must be configured through a specific policy and is not enabled globally by default. Careful planning is required to ensure WAN links can handle the additional bandwidth usage without causing network congestion.
- A. Correct.
Correct. Packet duplication works by sending duplicate packets over different WAN links, ensuring at least one copy reaches the destination even if a link has issues.
- B. Correct.
Correct. Since duplicate packets are sent over the WAN, the bandwidth usage increases proportionally to the amount of duplicated traffic.
- C. Incorrect.
Incorrect. Packet duplication needs to be explicitly configured as part of a policy and is not automatically applied to all applications.
- D. Correct.
Correct. Packet duplication is particularly beneficial for real-time, latency-sensitive applications (e.g., voice or video) that cannot tolerate packet loss.
- E. Incorrect.
Incorrect. While high bandwidth can help prevent congestion, packet duplication can still be useful on lower-bandwidth links if critical applications require reliability.