This NSE4 practice question tests your understanding of system and network administration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which protocol does FortiGate use to synchronize sessions between HA cluster members?
HSRP
Why wrong: HSRP is Cisco proprietary.
OSPF
Why wrong: OSPF is a routing protocol.
VRRP
Why wrong: VRRP is used by some other vendors but not FortiGate HA.
FGCP
FGCP is FortiGate's proprietary HA protocol.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
FGCP
FortiGate uses the FortiGate Cluster Protocol (FGCP) to synchronize session tables, configuration, and state information between HA cluster members. FGCP is a proprietary protocol that ensures seamless failover by replicating session data in real time, allowing the backup unit to take over active sessions without interruption.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
HSRP
Why it's wrong here
HSRP is Cisco proprietary.
OSPF
Why it's wrong here
OSPF is a routing protocol.
VRRP
Why it's wrong here
VRRP is used by some other vendors but not FortiGate HA.
FGCP
Why this is correct
FGCP is FortiGate's proprietary HA protocol.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates familiar with Cisco or open-standard redundancy protocols (HSRP, VRRP) may assume FortiGate uses one of those, but FortiGate relies on its proprietary FGCP for HA session synchronization.
Detailed technical explanation
FGCP operates by designating a primary unit that replicates session and configuration data to secondary units over a dedicated HA heartbeat interface, using UDP port 703. In active-passive HA mode, the standby unit maintains a synchronized session table but does not forward traffic; upon failover, it takes over the virtual IP and MAC addresses to continue existing sessions. A subtle behavior is that FGCP supports session-pickup only for TCP and UDP sessions, not for non-stateful protocols like ICMP unless explicitly configured.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
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FAQ
System and Network Administration — This question tests System and Network Administration — Read the scenario before looking for a memorised answer..
The correct answer is: FGCP — FortiGate uses the FortiGate Cluster Protocol (FGCP) to synchronize session tables, configuration, and state information between HA cluster members. FGCP is a proprietary protocol that ensures seamless failover by replicating session data in real time, allowing the backup unit to take over active sessions without interruption.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This NSE4 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 NSE4 exam.
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