Quick Answer
The answer is a VDOM link connecting VDOM-A and VDOM-B. Without this logical interconnecting interface, the two VDOMs remain isolated at Layer 3, so no firewall policy or static route can forward traffic between them, even if policies are correctly configured on each side. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding that inter-VDOM routing requires a dedicated VDOM link to establish adjacency, not just separate port assignments and policies. A common trap is assuming that a policy allowing traffic from port1 to the VDOM link is sufficient, but the link itself must first exist as a paired interface spanning both VDOMs. Remember the memory tip: “No link, no link” — without the VDOM link, VDOMs cannot communicate, regardless of firewall rules.
This NSE7 practice question tests your understanding of enterprise firewall and vdoms. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An administrator configures VDOMs on a FortiGate and assigns port1 to VDOM-A and port2 to VDOM-B. The administrator then creates a firewall policy in VDOM-A to allow traffic from port1 to the VDOM link. Traffic from VDOM-A to VDOM-B is still failing. What is the most likely missing configuration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
An inter-VDOM routing policy under system settings
Why wrong: No global inter-VDOM policy exists.
A policy in VDOM-B allowing traffic from the VDOM link to port2
Why wrong: The VDOM link itself is missing.
A static route in VDOM-A pointing to VDOM-B's subnet
Why wrong: Routing is needed but the VDOM link must exist first.
A VDOM link connecting VDOM-A and VDOM-B
The VDOM link is required for inter-VDOM communication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A VDOM link connecting VDOM-A and VDOM-B
The most likely missing configuration is a VDOM link, which is the logical interconnecting interface required to route traffic between VDOMs. Without a VDOM link, VDOM-A and VDOM-B are isolated from each other, and no firewall policy or route can forward traffic between them. The administrator must create a VDOM link (e.g., using the 'config system vdom-link' command) to establish the Layer 3 adjacency needed for inter-VDOM communication.
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.
An inter-VDOM routing policy under system settings
Why it's wrong here
No global inter-VDOM policy exists.
A policy in VDOM-B allowing traffic from the VDOM link to port2
Why it's wrong here
The VDOM link itself is missing.
A static route in VDOM-A pointing to VDOM-B's subnet
Why it's wrong here
Routing is needed but the VDOM link must exist first.
A VDOM link connecting VDOM-A and VDOM-B
Why this is correct
The VDOM link is required for inter-VDOM communication.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often assume a firewall policy alone is sufficient for inter-VDOM traffic, overlooking the mandatory requirement of a VDOM link to create the logical path between VDOMs before any policy or route can be applied.
Detailed technical explanation
A VDOM link is a virtual pair of interfaces (e.g., 'vdom-link1' and 'vdom-link2') that are created in the global VDOM context and then assigned to different VDOMs, providing a direct Layer 3 connection between them. Traffic crossing a VDOM link is subject to firewall policies in both VDOMs, and the link itself does not require an IP address by default—routing is handled via static routes or dynamic routing protocols like OSPF. In real-world deployments, VDOM links are essential for multi-tenant environments where separate VDOMs must exchange traffic securely, such as a shared internet breakout or inter-departmental communication.
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
Enterprise Firewall and VDOMs — This question tests Enterprise Firewall and VDOMs — Read the scenario before looking for a memorised answer..
The correct answer is: A VDOM link connecting VDOM-A and VDOM-B — The most likely missing configuration is a VDOM link, which is the logical interconnecting interface required to route traffic between VDOMs. Without a VDOM link, VDOM-A and VDOM-B are isolated from each other, and no firewall policy or route can forward traffic between them. The administrator must create a VDOM link (e.g., using the 'config system vdom-link' command) to establish the Layer 3 adjacency needed for inter-VDOM communication.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An administrator configures a VDOM on a FortiGate and assigns two interfaces (port1, port2) to it. The administrator wants to route traffic between two different subnets within the same VDOM. Which configuration is required?
mediumWhy D: Option D is correct because routing between two subnets within the same VDOM is standard intra-VDOM routing. Since both interfaces (port1, port2) belong to the same VDOM, no inter-VDOM constructs are needed; the FortiGate simply requires a route (static or dynamic) to forward packets between the subnets. A firewall policy allowing the traffic is also necessary, but the question specifically asks for the routing configuration.
Last reviewed: Jun 24, 2026
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