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.
A network administrator is configuring inter-VDOM routing between two VDOMs: VDOM-A and VDOM-B. The administrator creates a inter-VDOM link and adds routes pointing to the link. However, traffic from VDOM-A to VDOM-B fails. 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.
Both VDOMs must be in transparent mode
Why wrong: Inter-VDOM routing works in both modes.
The inter-VDOM link must be in the same VDOM
Why wrong: Inter-VDOM links span two VDOMs.
The management VDOM must be enabled
Why wrong: Management VDOM is for central management, not required for inter-VDOM routing.
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 firewall policy must be created in each VDOM to permit traffic across the inter-VDOM link
In FortiGate, inter-VDOM routing requires firewall policies in each VDOM to explicitly permit traffic across the inter-VDOM link. Without these policies, the FortiGate drops the traffic even if routes are correctly configured, because the inter-VDOM link behaves like a virtual interface that requires policy-based access control.
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.
Both VDOMs must be in transparent mode
Why it's wrong here
Inter-VDOM routing works in both modes.
The inter-VDOM link must be in the same VDOM
Why it's wrong here
Inter-VDOM links span two VDOMs.
The management VDOM must be enabled
Why it's wrong here
Management VDOM is for central management, not required for inter-VDOM routing.
Common exam traps
The trap here is that candidates assume routing alone is sufficient for inter-VDOM communication, overlooking FortiGate's requirement for explicit firewall policies to permit traffic across VDOM boundaries, similar to how policies are needed between physical interfaces.
Detailed technical explanation
The inter-VDOM link creates a pair of virtual interfaces, one in each VDOM, that are logically connected. Traffic traversing this link must be permitted by firewall policies in both VDOMs, as FortiGate applies stateful inspection at each VDOM boundary. In real-world deployments, forgetting to create policies on both sides is a common oversight, especially when administrators focus only on routing configuration.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 firewall policy must be created in each VDOM to permit traffic across the inter-VDOM link — In FortiGate, inter-VDOM routing requires firewall policies in each VDOM to explicitly permit traffic across the inter-VDOM link. Without these policies, the FortiGate drops the traffic even if routes are correctly configured, because the inter-VDOM link behaves like a virtual interface that requires policy-based access control.
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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Last reviewed: Jun 24, 2026
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.
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