300-415 Question 288
Select 3You are configuring a Cisco SD-WAN solution for a critical application that requires high reliability and low latency. To achieve this, you decide to enable packet duplication. Which of the following statements accurately describe the packet duplication feature in Cisco SD-WAN?
- A
Packet duplication sends identical packets over multiple WAN links to improve reliability.
- B
Packet duplication can increase bandwidth consumption on WAN links.
- C
Packet duplication is automatically enabled for all traffic once QoS is configured.
- D
Packet duplication requires configuring the feature in the Application-Aware Routing policy.
- E
Packet duplication reduces the likelihood of packet loss at the expense of additional latency.
Show answer and explanation
Correct answers: A, B, D
Explanation
Packet duplication in Cisco SD-WAN is a feature designed to improve application reliability by sending identical packets over multiple WAN paths. This ensures that at least one copy of the packet reaches the destination even in the event of link degradation or failure. However, this comes at the cost of increased bandwidth usage. The feature must be explicitly enabled within the Application-Aware Routing policy and is not automatically applied to all traffic.
- A. Correct.
Correct: Packet duplication works by sending identical copies of packets over multiple WAN links to ensure at least one packet reaches the destination, enhancing reliability.
- B. Correct.
Correct: Since identical packets are sent over multiple links, this naturally increases bandwidth consumption on those links.
- C. Incorrect.
Incorrect: Packet duplication is not automatically enabled for all traffic. It must be explicitly configured for specific traffic flows.
- D. Correct.
Correct: Packet duplication is configured as part of the Application-Aware Routing policy in Cisco SD-WAN to ensure it applies to specific application traffic.
- E. Incorrect.
Incorrect: Packet duplication does not add latency; it ensures reliability by using multiple paths, but at the cost of higher bandwidth usage.