300-415 Question 294
Single answerAn enterprise is using Cisco SD-WAN in their network and has enabled Forward Error Correction (FEC) on a specific application traffic flow. During a review of the network performance, they notice that packet loss is occurring on one of the WAN links. How does FEC help to mitigate the effects of packet loss in this scenario?
- A
FEC eliminates the need for retransmissions by sending redundant data packets along with the original data.
- B
FEC dynamically switches the traffic to a more reliable link to avoid packet loss.
- C
FEC delays the transmission of packets until the network stabilizes, preventing further loss.
- D
FEC compresses the data to minimize the size of packets, reducing the risk of packet loss.
Show answer and explanation
Correct answer: A
Explanation
Forward Error Correction (FEC) is a technique used in Cisco SD-WAN to mitigate the effects of packet loss by sending redundant data packets along with the original data. This redundancy allows the receiver to reconstruct missing packets without the need for retransmissions, improving application performance in lossy network conditions. This makes Option 1 the correct answer.
- A. Correct.
FEC works by sending redundant data packets that allow the receiver to reconstruct lost packets without requiring retransmissions. This is the correct functionality of FEC.
- B. Incorrect.
This describes path selection and dynamic rerouting, which is not the function of FEC. FEC does not switch traffic to alternate links.
- C. Incorrect.
FEC does not delay transmissions. It operates by adding redundancy to data streams to counteract packet loss.
- D. Incorrect.
FEC is not related to data compression. Its purpose is to provide error correction by adding redundancy, not reducing packet size.