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.
An administrator configures inter-VDOM routing between VDOM-A and VDOM-B using a VDOM link. The default route in VDOM-A points to a next-hop router, and VDOM-B has a static route to a subnet behind VDOM-A. Users in VDOM-B cannot reach that subnet. The administrator runs 'diagnose ip route list' in both VDOMs and sees the routes are present. What is the most likely cause?
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 on the VDOMs to permit traffic between the VDOM link and the destination interfaces
Even though the routes are present in both VDOMs, inter-VDOM routing via a VDOM link requires explicit firewall policies on each VDOM to permit traffic between the VDOM link interface and the destination interface. Without these policies, the FortiGate drops the traffic at the firewall layer, even though the routing table is correct. This is a common misconfiguration because VDOM links behave like physical interfaces and are subject to firewall policy enforcement.
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 VDOM link MTU is too small for the traffic
Why it's wrong here
MTU issues would cause fragmentation or packet loss, not complete unreachability.
✗
The VDOM link interfaces are administratively down
Why it's wrong here
The administrator would see the link status and the route list would likely show the link as down.
✓
Firewall policies are missing on the VDOMs to permit traffic between the VDOM link and the destination interfaces
Why this is correct
Correct.
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 (ADOMs) on FortiManager
Why it's wrong here
ADOMs are a management concept; they do not affect inter-VDOM routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume that because routes are present and the VDOM link is up, traffic should flow automatically, forgetting that FortiGate enforces firewall policies even for inter-VDOM traffic.
Trap categories for this question
Command / output trap
The administrator would see the link status and the route list would likely show the link as down.
Detailed technical explanation
How to think about this question
In FortiOS, VDOM links are logical interfaces that connect two VDOMs at Layer 3. For traffic to flow between VDOMs, each VDOM must have a firewall policy that allows traffic from the VDOM link interface to the destination interface (or vice versa), with the action set to 'accept'. The routing table only determines the next hop; the firewall policy is the gatekeeper that permits or denies the actual packet forwarding. This is analogous to how traffic between two physical interfaces in the same VDOM requires a policy.
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 on the VDOMs to permit traffic between the VDOM link and the destination interfaces — Even though the routes are present in both VDOMs, inter-VDOM routing via a VDOM link requires explicit firewall policies on each VDOM to permit traffic between the VDOM link interface and the destination interface. Without these policies, the FortiGate drops the traffic at the firewall layer, even though the routing table is correct. This is a common misconfiguration because VDOM links behave like physical interfaces and are subject to firewall policy enforcement.
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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