Forward Error Correction (FEC) is a method that improves reliability over lossy networks, including IPSec tunnels.
Configuring fec-ingress and fec-egress parameters ensures that data packets are error-checked and corrected at both the ingress and egress of the IPSec tunnel, reducing the impact of packet loss and improving overall reliability.
A is correct option.
Reference:
https://community.fortinet.com/t5/FortiClient/Technical-Tip-Configuring-DPD-dead-peer-detection-on-IPsec-VPN/ta-p/192616
A is the correct option. This is briefly explained in the Study Guide on page 317.
More detailed information can be found here: https://community.fortinet.com/t5/FortiGate/Technical-Tip-Forward-Error-Correction-for-IPsec-VPN/ta-p/191567
The answer A is correct - Enterprise_Firewall_7.2_Study_Guide - page - 317 - "it improves reliability that can overcome adverse WAN conditions such as lossy or noisy links"
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