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Question 54 Discussion
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Selected Answers: B
Spanning Tree Protocol is the correct answer because the topology described is a full Layer-2 mesh, where every FortiSwitch connects to every other FortiSwitch, which inherently creates switching loops. STP is the protocol responsible for detecting those loops and blocking redundant paths while still preserving connectivity and failover. Although MCLAG provides link and device redundancy by allowing two distribution switches to operate as a single logical endpoint for LAGs, it does not independently prevent loops across the entire network.
In fact, Fortinet MCLAG explicitly relies on STP through the mclag-stp-aware feature, which runs STP on inter-chassis links to detect and prevent loops caused by non-ICL connections. This confirms that STP remains the underlying loop-prevention mechanism even in MCLAG designs. Therefore, when every switch is interconnected for maximum redundancy, STP is required to maintain network stability, making it the correct choice over MCLAG, LAG, or any non-existent full-mesh HA feature.
PAGE: 178 | FORTISWITCH 7.6 ADMIN GUIDE
You are designing a FortiSwitch backbone where every FortiSwitch device must connect to every other FortiSwitch for maximum redundancy. To maintain connectivity while preventing loops, which protocol or feature must you configure on the switches? (Choose one answer)
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