300-415 Question #447: Real Exam Question with Answer & Explanation

The correct answer is C: protection against packet loss. Packet duplication in SD-WAN sends identical packets across multiple WAN transport paths simultaneously, primarily providing protection against packet loss.

Security and Quality of Service

Question

Which benefit does packet duplication provide?

Options

Apacket data policy protection
Bsession security
Cprotection against packet loss
Dprevention of frame loss

Explanation

Packet duplication in SD-WAN sends identical packets across multiple WAN transport paths simultaneously, primarily providing protection against packet loss.

Common mistakes.

A. Packet data policy protection relates to security policies that define how traffic is handled or secured, not to the mechanism of sending duplicate packets.
B. Session security is typically achieved through encryption and authentication protocols like IPsec or TLS, which is distinct from simply duplicating packets.
D. Frame loss refers to data link layer (Layer 2) issues, whereas packet duplication in SD-WAN operates at the network layer (Layer 3) to protect against packet loss across different WAN paths.

Concept tested. Cisco SD-WAN packet duplication benefits

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-cr-book/sdwan-quality-of-experience-policies.html

Topics

#Packet Duplication#SD-WAN Reliability#Packet Loss Prevention#QoS

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