NSE4 · Question #386
Which of the following statements are true regarding WAN Link Load Balancing? (Choose two).
The correct answer is A. There can be only one virtual WAN Link per VDOM. C. Link health checks can be performed over each link member if the virtual WAN interface. WAN Link Load Balancing on FortiGate allows a VDOM to have a single virtual WAN Link interface, which performs health checks on its member interfaces to assess their availability and performance.
Question
Which of the following statements are true regarding WAN Link Load Balancing? (Choose two).
Options
- AThere can be only one virtual WAN Link per VDOM.
- BFortiGate can measure the quality of each link based on latency, jitter, or packets percentage.
- CLink health checks can be performed over each link member if the virtual WAN interface.
- DDistance and priority values are configured in each link member if the virtual WAN interface.
How the community answered
(26 responses)- A88% (23)
- B4% (1)
- D8% (2)
Why each option
WAN Link Load Balancing on FortiGate allows a VDOM to have a single virtual WAN Link interface, which performs health checks on its member interfaces to assess their availability and performance.
FortiGate VDOMs are limited to configuring a single virtual WAN Link interface (typically named sd-wan or wan-link) to aggregate multiple physical or VLAN interfaces for load balancing.
While FortiGate measures link quality, the specific metric "packets percentage" is not a standard quality metric like packet loss, latency, or jitter used for performance-based load balancing.
Link health checks are essential for WAN Link Load Balancing, actively monitoring the status and performance of each individual member interface to ensure traffic is directed only to healthy and performant links.
Distance and priority values are primarily used in routing tables to select routes; for WAN Link Load Balancing, specific rules, metrics, and implicit priorities based on health checks and link status guide traffic distribution, not traditional routing distance/priority on the link members themselves.
Concept tested: FortiGate WAN Link Load Balancing features
Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/524345/sd-wan-basics
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