300-415 · Question #326
Which process is continued by Cisco SD-WAN when packet duplication is enabled?
The correct answer is C. Copies of packets are sent over multiple WAN circuits to overcome packet loss. When packet duplication is enabled in Cisco SD-WAN, copies of original packets are simultaneously sent over multiple WAN circuits to ensure delivery and overcome packet loss, thereby improving application reliability.
Question
Exhibit
Options
- AAdditional headers are added to outgoing packets to perform custom routing policies.
- BDynamic traffic is compressed and signaled before it is forwarded though the WAN.
- CCopies of packets are sent over multiple WAN circuits to overcome packet loss.
- DApplication traffic is analyzed to find patterns and enable custom detection rules.
How the community answered
(60 responses)- A3% (2)
- B2% (1)
- C88% (53)
- D7% (4)
Why each option
When packet duplication is enabled in Cisco SD-WAN, copies of original packets are simultaneously sent over multiple WAN circuits to ensure delivery and overcome packet loss, thereby improving application reliability.
Adding additional headers for routing policies is a general function of the SD-WAN overlay, but it does not specifically describe the process of packet duplication.
Compressing and signaling dynamic traffic are separate optimization features in SD-WAN, distinct from the packet duplication mechanism.
Packet duplication, also known as packet replication, is a Cisco SD-WAN feature where identical copies of data packets are sent across different WAN circuits. This increases the likelihood that at least one copy reaches the destination, effectively mitigating the impact of packet loss and improving application performance.
Analyzing application traffic for patterns and custom detection rules relates to application recognition and deep packet inspection, which is a different functionality than packet duplication.
Concept tested: SD-WAN packet duplication function
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-fec-packet-duplication.html
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