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NSE4 · Question #93

In a high availability cluster operating in active-active mode, which of the following correctly describes the path taken by the SYN packet of an HTTP session that is offloaded to a slave unit?

The correct answer is D. Request: internal host; master FortiGate; slave FortiGate; Internet; web server. This question describes the path of a SYN packet in an active-active FortiGate HA cluster when a session is offloaded to a slave unit.

Submitted by fatima_kr· Apr 18, 2026FortiGate Deployment and System Configuration

Question

In a high availability cluster operating in active-active mode, which of the following correctly describes the path taken by the SYN packet of an HTTP session that is offloaded to a slave unit?

Options

  • ARequest: internal host; slave FortiGate; master FortiGate; Internet; web server.
  • BRequest: internal host; slave FortiGate; Internet; web server.
  • CRequest: internal host; slave FortiGate; master FortiGate; Internet; web server.
  • DRequest: internal host; master FortiGate; slave FortiGate; Internet; web server.

How the community answered

(50 responses)
  • A
    4% (2)
  • B
    2% (1)
  • C
    12% (6)
  • D
    82% (41)

Why each option

This question describes the path of a SYN packet in an active-active FortiGate HA cluster when a session is offloaded to a slave unit.

ARequest: internal host; slave FortiGate; master FortiGate; Internet; web server.

This path incorrectly suggests the SYN packet goes through the slave first, then the master, then the Internet; all traffic in active-active HA is initially received by the master.

BRequest: internal host; slave FortiGate; Internet; web server.

This path suggests the SYN packet goes directly to the slave from the internal host, bypassing the master entirely, which is incorrect for initial session establishment in FortiGate active-active HA.

CRequest: internal host; slave FortiGate; master FortiGate; Internet; web server.

This path is identical to choice A and suffers from the same incorrect assumption that the slave receives the initial packet before the master.

DRequest: internal host; master FortiGate; slave FortiGate; Internet; web server.Correct

In an active-active FortiGate HA cluster, all traffic initially enters the master FortiGate. If the master determines that a session should be offloaded to a slave unit, the initial SYN packet is forwarded from the master to the designated slave unit for processing, which then handles the session directly with the Internet/web server.

Concept tested: FortiGate active-active HA session offloading

Source: https://docs.fortinet.com/document/fortigate/7.4.0/fortios-high-availability/697940/active-active-ha

Topics

#High Availability (HA)#Active-Active HA#Session Offloading#Traffic Flow

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