When configuring SD-WAN for load balancing, an administrator should consider the available distribution algorithms and how different strategies utilize them. FortiGate provides a volume-based load-balancing algorithm, which distributes traffic based on configured ratios that can reflect the outbound bandwidth of each link. This method is available for strategies that support load balancing, such as maximize-bandwidth and manual.

Additionally, a key consideration is the maximize-bandwidth (SLA) strategy. This strategy is specifically designed to load balance traffic across all member interfaces that are performing within the defined SLA targets for latency, jitter, and packet loss, thereby maximizing the usable bandwidth.

B. Only the manual and best-quality strategies allow SD-WAN load balancing.

This is incorrect because the best-quality strategy selects only one single best link; it does not perform load balancing.

D. SD-WAN load balancing is possible only using the best quality and lowest cost (SLA) strategies.

This is incorrect as best-quality does not load balance, and this option omits the primary load-balancing strategy, maximize-bandwidth (SLA), as well as the manual strategy.

1. Fortinet FCSS - SD-WAN 7.4 Study Guide

"SD-WAN Rules"

Page 89

92.

Page 92 states for the Maximize Bandwidth (SLA) strategy: "FortiGate identifies all member interfaces that are within the SLA target

and then load balances traffic among them." This directly supports option C.

Page 90 clarifies the Best Quality strategy: "It then chooses the best link based on the configured quality criteria." This confirms it does not load balance

invalidating options B and D.

2. Fortinet FCSS - SD-WAN 7.4 Study Guide

"SD-WAN Load Balancing"

Page 99

100.

Page 100 describes the Volume algorithm: "FortiGate sends more traffic to the links with a higher-volume ratio. The ratio can be based on the link’s bandwidth capacity." This supports the concept in option A of load balancing based on bandwidth. These algorithms are applicable to strategies like maximize-bandwidth and manual.