300-415 Question 292
Single answerYou are configuring Forward Error Correction (FEC) on a Cisco SD-WAN solution to improve video conferencing performance over a lossy WAN link. What is the primary benefit of enabling FEC in this scenario?
- A
It reduces packet loss by proactively recreating lost packets at the receiving end.
- B
It increases bandwidth availability by compressing data traffic.
- C
It eliminates the need for retransmissions by ensuring packets are delivered in order.
- D
It improves latency by prioritizing video conferencing traffic over other types of traffic.
Show answer and explanation
Correct answer: A
Explanation
Forward Error Correction (FEC) adds redundant data to streams, allowing the receiver to reconstruct lost packets without requiring retransmissions. This makes FEC particularly beneficial for real-time applications like video conferencing, which are highly sensitive to packet loss and cannot afford the delays associated with retransmissions.
- A. Correct.
This is correct. FEC works by adding redundant data to the original data stream, allowing the receiver to reconstruct lost packets without the need for retransmissions. This is particularly useful in lossy networks, such as for video conferencing over unreliable WAN links.
- B. Incorrect.
This is incorrect. FEC does not increase bandwidth availability or compress data traffic. Instead, it actually introduces some additional overhead by sending redundant data.
- C. Incorrect.
This is incorrect. While FEC reduces the need for retransmissions, it does not guarantee in-order delivery of packets. Ordered delivery is handled by higher-layer protocols like TCP.
- D. Incorrect.
This is incorrect. FEC does not improve latency directly or prioritize traffic. Traffic prioritization is managed by QoS mechanisms, not FEC.