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NSE 5 - FortiSwitch 7.6 Administrator Exam Materials-Question 59 Discussion
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You are deploying a multitier FortiSwitch topology with redundant links between access and aggregation switches. The team is considering Multiple Spanning Tree Protocol (MSTP) to manage spanning tree across multiple VLANs. Which two Rapid STP (RSTP) features would be useful in this deployment to ensure fast convergence and predictable port roles? (Choose two answers)

  • A. The process for selecting the root bridge
  • B. Recalculating paths after a topology change
  • C. Automatic VLAN assignment
  • D. The rules for determining port roles
Correct Answer: A,D

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javaughn Bryan 2025-12-18 18:22:39

Selected Answers: A, D


Options A and D are correct.

They represent the specific mechanisms within the RSTP and MSTP standards that allow for a controlled and efficient loop-free environment. The process for selecting the root bridge is essential for creating a predictable topology because it allows you to manually influence which switch becomes the central point of the spanning tree, ensuring that traffic follows the most efficient path through high-bandwidth aggregation links.

Meanwhile, the rules for determining port roles are the primary drivers of fast convergence; by defining specific roles such as alternate and backup, the protocol can pre-calculate secondary paths that transition to a forwarding state immediately if a primary link fails, bypassing the slow listening and learning timers used in legacy spanning tree.

PAGE: 138 | FORTISWITCH 7.6 ADMIN GUIDE


Harrison Hord 2026-10-19 07:38:45

Selected Answers: B, D


A is incorrect: The process and criteria for selecting the root bridge (lowest Bridge ID based on priority and MAC address) are identical in standard STP (802.1D) and RSTP (802.1w)
; this is not a new or unique feature introduced by RSTP to achieve rapid convergence.
Why B is correct: from the book - FortiSwitch 7.6 Admin Guide, page 138
"The most important benefit of RSTP is its much faster convergence to topology changes. With STP, the
network takes between 30–50 seconds to converge, whereas in RSTP, it can take 6 seconds or less."