Fortinet NSE8_812 Practice Test 1
Review the VPN configuration shown in the exhibit.
What is the Forward Error Correction behavior if the SD-WAN network traffic download is 500 Mbps and has 8% of packet loss in the environment?
1 redundant packet for every 10 base packets
3 redundant packet for every 5 base packets
2 redundant packet for every 8 base packets
3 redundant packet for every 9 base packets
The FEC configuration in the exhibit specifies that if the packet loss is greater than 10%, then the FEC mapping will be 8 base packets and 2 redundant packets. The download bandwidth of 500 Mbps is not greater than 950 Mbps, so the FEC mapping is not overridden by the bandwidth setting. Therefore, the FEC behavior will be 2 redundant packets for every 8 base packets.
Here is the explanation of the FEC mappings in the exhibit:
Packet loss greater than 10%:8 base packets and 2 redundant packets.
Upload bandwidth greater than 950 Mbps:9 base packets and 3 redundant packets.
The mappings are matched from top to bottom, so the first mapping that matches the conditions will be used. In this case, the first mapping matches because the packet loss is greater than 10%. Therefore, the FEC behavior will be 2 redundant packets for every 8 base packets.