300-415 Question 289
Select 3A network administrator is configuring a Cisco SD-WAN network for high reliability over a dual transport (MPLS and Internet) setup. The administrator enables packet duplication on a critical application to ensure minimal packet loss. During testing, some issues are observed. Which of the following considerations should the administrator account for when using the packet duplication feature?
- A
Packet duplication will increase bandwidth utilization on both transport links.
- B
Packet duplication can only be enabled for traffic destined for a single transport link.
- C
Packet duplication reduces packet loss but may increase the likelihood of out-of-order packets.
- D
Packet duplication should not be used for applications that are sensitive to latency or jitter.
- E
Packet duplication requires additional configuration on the application servers to handle duplicate packets.
Show answer and explanation
Correct answers: A, C, D
Explanation
Packet duplication in Cisco SD-WAN is a feature that enhances reliability by sending duplicate copies of packets over multiple transport links. While it reduces packet loss, it comes with the trade-offs of increased bandwidth consumption and potential out-of-order packets due to differences in transport link characteristics. Additionally, the feature may introduce latency or jitter, making it unsuitable for certain latency-sensitive applications. Understanding these considerations is critical to deploying packet duplication effectively in an SD-WAN environment.
- A. Correct.
Correct. Packet duplication sends copies of the same traffic over both transport links, which increases bandwidth usage on both.
- B. Incorrect.
Incorrect. Packet duplication works across multiple transport links to ensure redundancy and reliability, not just for a single link.
- C. Correct.
Correct. While packet duplication reduces packet loss, it may lead to out-of-order packets due to differences in latency between the transport links.
- D. Correct.
Correct. Packet duplication can exacerbate latency or jitter issues, making it unsuitable for applications that are highly sensitive to such conditions.
- E. Incorrect.
Incorrect. Packet duplication is handled at the Cisco SD-WAN edge routers and does not require additional configuration on the application servers.