NSE4 · Question #37
What are the requirements for a HA cluster to maintain TCP connections after device or link failover? (Choose two.)
The correct answer is A. Enable session pick-up. D. Connections must not be handled by a proxy. To ensure TCP connections persist after a FortiGate HA cluster failover, session pick-up must be enabled, and the connections must not be processed by proxy-based services.
Question
What are the requirements for a HA cluster to maintain TCP connections after device or link failover? (Choose two.)
Options
- AEnable session pick-up.
- BEnable override.
- CConnections must be UDP or ICMP.
- DConnections must not be handled by a proxy.
How the community answered
(38 responses)- A92% (35)
- B3% (1)
- C5% (2)
Why each option
To ensure TCP connections persist after a FortiGate HA cluster failover, session pick-up must be enabled, and the connections must not be processed by proxy-based services.
Enabling session pick-up allows the FortiGate HA cluster to synchronize active session states between the master and slave units, enabling the new master to seamlessly take over existing TCP connections during a failover.
Enabling override influences the HA master election process but does not directly contribute to session persistence or pick-up.
The question specifically asks about TCP connections, which are stateful; UDP and ICMP connections are handled differently and are not the primary concern for session pick-up due to their connectionless nature or limited state.
Connections handled by proxy-based services (e.g., explicit proxy, certain deep inspection) are terminated and re-established by the FortiGate, which prevents the original TCP session from being picked up by the new master during a failover.
Concept tested: FortiGate HA session failover, session pickup
Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/52671/session-pickup
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