The answer is to configure a VDOM link between CustomerA and CustomerB. This is required because VDOMs on a FortiGate operate as fully isolated virtual firewalls; without a VDOM link, no Layer-2 or Layer-3 traffic can pass between them, even if inter-VDOM policies are already in place. The VDOM link creates a virtual interface pair that bridges the two VDOMs, enabling the HTTP server access by forwarding traffic across the internal boundary. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of inter-VDOM routing fundamentals—a common trap is assuming that policies alone suffice, when in fact the link itself is the missing connectivity layer. Remember the memory tip: “Policies permit, but links connect”—without the VDOM link, the VDOMs remain silos, regardless of rule sets.
NSE7 Enterprise Firewall and VDOMs Practice Question
This NSE7 practice question tests your understanding of enterprise firewall and vdoms. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 FortiGate running FortiOS 7.4.1 has two VDOMs: CustomerA and CustomerB. The administrator wants CustomerA to access an HTTP server in CustomerB. Both VDOMs have appropriate policies. What additional configuration is required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a VDOM link between CustomerA and CustomerB
A VDOM link is required to enable Layer-2 or Layer-3 connectivity between two VDOMs on the same FortiGate. Without a VDOM link, the VDOMs are isolated from each other, even if policies exist. The VDOM link acts as a virtual interface pair that forwards traffic between CustomerA and CustomerB, allowing the HTTP server access.
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.
✓
Configure a VDOM link between CustomerA and CustomerB
Why this is correct
A VDOM link is a virtual interface pair that connects VDOMs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a policy allowing traffic from CustomerA to CustomerB
Why it's wrong here
Policies are needed, but without a link, traffic cannot cross VDOMs.
✗
Enable inter-VDOM routing under system settings
Why it's wrong here
Inter-VDOM routing is enabled by default, but a link must exist.
✗
Assign both VDOMs to the same administrative domain in FortiManager
Why it's wrong here
This does not enable inter-VDOM routing on the FortiGate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume inter-VDOM policies alone suffice, forgetting that VDOMs are fully isolated routing domains requiring a dedicated link (VDOM link) to exchange traffic.
Detailed technical explanation
How to think about this question
A VDOM link creates a pair of virtual interfaces (e.g., vdom-link1 and vdom-link2) that belong to different VDOMs, with traffic passing through the FortiGate’s internal switch fabric. This is similar to a virtual patch cable; each side of the link must have an IP address in the respective VDOM’s routing table. In FortiOS 7.4.1, VDOM links support both Layer-2 and Layer-3 modes, and the administrator must ensure the policies in each VDOM allow the traffic on the link interface.
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 practitioner preparing for the NSE7 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: Configure a VDOM link between CustomerA and CustomerB — A VDOM link is required to enable Layer-2 or Layer-3 connectivity between two VDOMs on the same FortiGate. Without a VDOM link, the VDOMs are isolated from each other, even if policies exist. The VDOM link acts as a virtual interface pair that forwards traffic between CustomerA and CustomerB, allowing the HTTP server access.
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.
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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