NSE4 · Question #554
In a high availability (HA) 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 secondary…
The correct answer is D. Client> primary FortiGate> secondary FortiGate> web server. In an active-active FortiGate HA cluster, the initial SYN packet of an offloaded HTTP session first hits the primary unit, which then forwards it to the secondary FortiGate for processing before it goes to the web server.
Question
In a high availability (HA) 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 secondary FortiGate?
Options
- AClient > primary FortiGate> secondary FortiGate> primary FortiGate> web server.
- BClient > secondary FortiGate> web server.
- CClient >secondary FortiGate> primary FortiGate> web server.
- DClient> primary FortiGate> secondary FortiGate> web server.
How the community answered
(35 responses)- A3% (1)
- B11% (4)
- C6% (2)
- D80% (28)
Why each option
In an active-active FortiGate HA cluster, the initial SYN packet of an offloaded HTTP session first hits the primary unit, which then forwards it to the secondary FortiGate for processing before it goes to the web server.
This path suggests the secondary FortiGate returns the traffic to the primary before reaching the server, which is incorrect; the secondary handles the session directly after offload.
This path bypasses the primary FortiGate entirely, which is incorrect for initial SYN packet processing and session offload in active-active HA.
This path incorrectly suggests the secondary unit forwards to the primary before reaching the web server, contradicting the direct flow of the offloaded session.
In an active-active FortiGate HA cluster, all initial traffic, including the SYN packet, ingress through the primary (master) unit. If the session is designated for offloading, the primary unit processes the SYN and then forwards the session to a secondary FortiGate for security processing and connection establishment, with the secondary unit then sending the traffic directly to the web server.
Concept tested: FortiGate Active-Active HA Session Offloading Path
Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/469902/ha-load-balancing-and-session-management
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