The correct answer is to create an inter-VDOM link between the 'customer' and 'root' VDOMs, then configure firewall policies to permit traffic. This is required because inter-VDOM links are the only supported method for routing traffic between VDOMs on the same FortiGate, creating a virtual point-to-point connection that allows traffic to flow through explicit policies; without this link, VDOMs remain fully isolated and cannot exchange traffic, even if static routes or BGP are configured. On the Fortinet NSE 7 Advanced Security NSE7 exam, this question tests your understanding of VDOM segmentation and the critical distinction that inter-VDOM routing is not automatic—it requires a dedicated link and policy, unlike routing between physical interfaces. A common trap is assuming that simply adding a static route or BGP across VDOMs will work, but the inter-VDOM link is the mandatory bridge. Memory tip: think of each VDOM as a separate FortiGate—you cannot route between them without plugging in a virtual cable, which is exactly what the inter-VDOM link provides.
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.
A FortiGate has two VDOMs: 'root' and 'customer'. The admin wants to route traffic from 'customer' to the internet via 'root', which has a BGP connection to an ISP. What is the required configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an inter-VDOM link between 'customer' and 'root', and configure policies to allow traffic
Option D is correct because inter-VDOM links are the only supported method for routing traffic between VDOMs on the same FortiGate. An inter-VDOM link creates a virtual point-to-point connection between two VDOMs, allowing traffic to flow through firewall policies. Without this link, VDOMs are isolated and cannot exchange traffic, even if static routes or BGP are configured.
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.
✗
Enable VDOM forwarding on the WAN interface in 'root'
Why it's wrong here
No such global setting; VDOM forwarding is through vdom-links.
✗
Configure a static route in 'customer' pointing to the 'root' VDOM's management IP
Why it's wrong here
Static routes need an inter-VDOM link interface, not management IP.
✗
Place both VDOMs in the same VDOM group and enable route leak
Why it's wrong here
VDOM groups do not provide routing; route leaking is not a standard feature.
✓
Create an inter-VDOM link between 'customer' and 'root', and configure policies to allow traffic
Why this is correct
Correct. The link provides connectivity; policies control traffic.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VDOMs can route traffic to each other simply by configuring static routes or using a shared interface, but FortiGate requires a dedicated inter-VDOM link with firewall policies to enable inter-VDOM traffic.
Detailed technical explanation
How to think about this question
Inter-VDOM links are implemented as a pair of virtual interfaces (one in each VDOM) that behave like a direct cable connection. Traffic between VDOMs must be explicitly allowed by firewall policies on both sides, and routing must be configured (e.g., static routes or dynamic routing protocols) to direct traffic into the inter-VDOM link. This design ensures strict separation of forwarding tables and security policies, which is critical in multi-tenant environments where each VDOM represents a different customer or department.
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: Create an inter-VDOM link between 'customer' and 'root', and configure policies to allow traffic — Option D is correct because inter-VDOM links are the only supported method for routing traffic between VDOMs on the same FortiGate. An inter-VDOM link creates a virtual point-to-point connection between two VDOMs, allowing traffic to flow through firewall policies. Without this link, VDOMs are isolated and cannot exchange traffic, even if static routes or BGP are configured.
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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