The answer is that firewall policies are missing or not allowing the traffic. Even when VDOM links are correctly configured with IP addresses and static routes, FortiGate enforces stateful inspection at every VDOM boundary, meaning inter-VDOM routing requires explicit firewall policies on both VDOMs to permit the traffic. Without these policies, the FortiGate drops the packets as if no route exists, which is why inter-VDOM routing not working often points directly to missing firewall policies. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding that VDOM links are Layer 3 connections, not security exemptions—a common trap is assuming static routes alone suffice. Remember the memory tip: “VDOM links give you a road, but firewall policies open the gate.”
NSE7 Enterprise Firewall and VDOMs Practice Question
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.
In a multi-VDOM deployment, inter-VDOM routing is configured using VDOM links. After configuring the VDOM links and adding static routes, traffic between VDOMs is not working. The administrator verifies that the VDOM link interfaces are up and have correct IP addresses. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Firewall policies are missing or not allowing the traffic
In a FortiGate multi-VDOM deployment, VDOM links create a direct Layer 3 connection between VDOMs, but traffic is still subject to firewall policies. Even with correct IP addresses and static routes, inter-VDOM traffic will be dropped unless explicit firewall policies are configured on both VDOMs to permit the traffic. This is because FortiGate enforces stateful inspection at every VDOM boundary, including VDOM links.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The inter-VDOM routing mode is set to 'nat' instead of 'route'
Why it's wrong here
Inter-VDOM routing mode is not a setting; VDOM links operate in routed mode.
✗
The VDOM links are not assigned to the correct VDOM
Why it's wrong here
If interfaces are up, they are likely assigned correctly.
✓
Firewall policies are missing or not allowing the traffic
Why this is correct
Each VDOM needs a policy to allow traffic from the VDOM link interface to the destination.
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.
✗
The VDOMs are in different administrative domains
Why it's wrong here
Administrative domains are a FortiManager concept, not a FortiGate VDOM concept.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume VDOM links bypass firewall policies because they are internal virtual connections, but FortiGate treats all inter-VDOM traffic as requiring explicit policy approval, unlike a simple router-on-a-stick design.
Detailed technical explanation
How to think about this question
VDOM links are implemented as virtual interfaces that behave like a direct Ethernet cable between VDOMs, but all traffic traversing them must pass through the FortiGate's firewall engine. Even though the link is internal, the FortiGate applies its full security policy lookup, including source/destination interfaces, addresses, and services. A common real-world scenario is when an administrator configures static routes correctly but forgets to add policies, resulting in dropped packets that can be observed via 'diagnose debug flow' showing 'deny by forward policy check'.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Enterprise Firewall and VDOMs — This question tests Enterprise Firewall and VDOMs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Firewall policies are missing or not allowing the traffic — In a FortiGate multi-VDOM deployment, VDOM links create a direct Layer 3 connection between VDOMs, but traffic is still subject to firewall policies. Even with correct IP addresses and static routes, inter-VDOM traffic will be dropped unless explicit firewall policies are configured on both VDOMs to permit the traffic. This is because FortiGate enforces stateful inspection at every VDOM boundary, including VDOM links.
What should I do if I get this NSE7 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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