Fortinet NSE5_SSE_AD-7.6 Exam - Topic 3 Question 2 Discussion

According to the SD-WAN 7.6 Core Administrator study guide and the FortiOS 7.6 Administration Guide, configuring load balancing within SD-WAN rules requires an understanding of how the engine selects and distributes sessions across multiple links.

SLA Target Logic (Option A): In FortiOS 7.6, the Lowest Cost (SLA) strategy has been enhanced. When the load-balance option is enabled for this strategy, the FortiGate does not just pick a single 'best' link; it identifies all member interfaces that currently meet the configured SLA target (e.g., latency < 100ms). It then load balances the traffic across all those healthy links to maximize resource utilization.

Hash Modes (Option D): When an SD-WAN rule is configured for load balancing (valid for Manual and Lowest Cost (SLA) strategies in 7.6), the administrator must define a hash mode to determine how sessions are distributed. While 'outsessions' in the question is a common exam-variant typo for outbandwidth (or sessions-based hashing), the core principle remains: you can select the specific load-balancing algorithm (e.g., source-ip, round-robin, or bandwidth-based) for all strategies where load-balancing is enabled.

Why other options are incorrect:

Option B and C: These options are too restrictive. In FortiOS 7.6, load balancing is not limited to only 'manual and best quality' or 'manual and lowest cost' in a singular way. The documentation highlights that Manual and Lowest Cost (SLA) are the primary strategies that support the explicit load-balance toggle to steer traffic through multiple healthy members simultaneously.