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A company has two remote sites connected via an SD-WAN overlay. The headquarters uses a FortiGate with two WAN links: Fiber (priority 1) and LTE (priority 2). The SD-WAN rule for business-critical traffic uses the 'best quality' strategy with SLA targets for latency and jitter. The fiber link occasionally experiences high jitter but low latency. The engineer notices that traffic is not failing over to LTE even when jitter exceeds the threshold. What is the most likely reason?
2An SD-WAN rule is configured with a 'manual' strategy and multiple members. The engineer wants to ensure that voice traffic always uses the MPLS link as long as it meets the SLA, otherwise use the broadband link. Which configuration is required?
3An administrator runs 'diagnose sys session filter dport 443' and then 'diagnose sys session list'. The output shows many sessions with 'proto_state=01' and 'expire=3599'. What does 'expire=3599' indicate?
4An active-passive HA cluster is experiencing frequent failovers. Which TWO factors could cause unnecessary failovers? (Choose two.)
5A FortiGate administrator is configuring an active-passive HA cluster and needs to ensure that management access is available via a dedicated management IP address that does not fail over. Which three steps should the administrator take? (Choose three.)
6An administrator runs 'diagnose debug flow' for a specific policy and sees the following output: id=20085 trace_id=10 func=vf_ip_route_in msg='No matching interface to route packet' What does this indicate?
7A network admin receives an alert that the FortiGate disk logs are no longer being written. The admin checks the disk status and sees that the disk is full. However, the admin needs to preserve the logs for compliance purposes. Which action should the admin take to continue logging while preserving the existing logs?
8A FortiGate administrator is configuring logging to meet a compliance requirement that all security events must be stored for at least one year. The FortiGate has limited local disk space. Which THREE actions should the administrator take to meet this requirement? (Choose three.)
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The High Availability and Diagnostics domain covers the key concepts tested in this area of the NSE4 exam blueprint published by Fortinet. Courseiva provides free domain-focused practice, mock exams, missed-question review, and readiness tracking across all NSE4 domains — no account required.
The Courseiva NSE4 question bank contains 8 questions in the High Availability and Diagnostics domain, covering the 20% of the exam attributed to this domain in the official Fortinet blueprint. Click any question to see the full explanation and answer breakdown.
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