300-415 · Question #325
What does forward error correction addresses in Cisco SD-WAN?
The correct answer is B. applications with occasional invalid data input and poor performance. Forward Error Correction (FEC) in Cisco SD-WAN addresses packet loss on WAN links, which can manifest as poor application performance or data integrity issues due to missing packets.
Question
Options
- Areduced application performance degradation related to service degradation
- Bapplications with occasional invalid data input and poor performance
- Ctraffic flows with increased delay over a particular transport
- Dinefficient traffic forwarding caused by inbound shapers
How the community answered
(50 responses)- A2% (1)
- B92% (46)
- C2% (1)
- D4% (2)
Why each option
Forward Error Correction (FEC) in Cisco SD-WAN addresses packet loss on WAN links, which can manifest as poor application performance or data integrity issues due to missing packets.
While FEC ultimately aims to reduce application performance degradation, this option is too general and does not specify the direct cause (packet loss) that FEC addresses.
Forward Error Correction (FEC) in Cisco SD-WAN is designed to mitigate the impact of packet loss on WAN links. By sending redundant data, FEC allows the receiver to reconstruct lost packets, thereby improving application performance that would otherwise suffer from packet loss and potentially result in incomplete or "invalid data" from an application's perspective.
FEC does not directly address increased delay (latency); its primary function is to combat packet loss.
FEC is unrelated to inbound traffic shaping; it is a mechanism for mitigating packet loss by adding redundancy to the data stream.
Concept tested: SD-WAN Forward Error Correction (FEC) 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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