NSE7 Enterprise Firewall and VDOMs Practice Question
An administrator is configuring a FortiGate HA cluster in active-passive mode. The company has two ISPs, and the primary FortiGate is connected to ISP1 and ISP2. The secondary FortiGate is connected only to ISP2. The administrator wants to ensure that failover occurs only if both ISP1 and ISP2 connections are lost on the primary device. Which configuration approach should be used?
⚠ Common exam trap
Candidates often confuse link-fail-signal with gateway monitoring or assume that setting HA priorities alone is sufficient, overlooking the need to explicitly enable link-fail-signal on the specific interfaces to trigger failover based on link status.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the HA priority of the primary to 1 and the secondary to 0, and enable link-fail-signal on both ISP interfaces on the primary, then set 'set ha-priority 1' on the primary and 'set ha-priority 0' on the secondary.
It uses link-fail-signal on both ISP interfaces of the primary FortiGate to detect physical link loss, and sets HA priorities (primary=1, secondary=0) so that failover occurs only when both ISP links are down. Link-fail-signal triggers an HA failover only when the monitored interface loses carrier, and since both ISP1 and ISP2 interfaces are monitored, the primary will only relinquish control when both links fail, meeting the requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use gateway monitoring with virtual router failover, and set the failure threshold to 2.
Why it's wrong here
Gateway monitoring typically affects routing tables and not HA priority directly.
- ✗
Configure gateway monitoring on the primary for ISP1 only, and set the HA failover threshold to 1.
Why it's wrong here
This would cause failover if ISP1 alone fails, even if ISP2 is still up.
- ✗
Set the HA priority of the primary to 1 and the secondary to 0, and enable link-fail-signal on both ISP interfaces on the primary.
Why it's wrong here
Link-fail-signal causes immediate priority drop on any single link failure, which would trigger failover if ISP1 fails even if ISP2 is up.
- ✓
Set the HA priority of the primary to 1 and the secondary to 0, and enable link-fail-signal on both ISP interfaces on the primary, then set 'set ha-priority 1' on the primary and 'set ha-priority 0' on the secondary.
Why this is correct
This ensures that the primary's priority drops to 0 only when both ISP links fail, since link-fail-signal reduces priority by 1 for each failed link.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.