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 VDOMs A and B using a VDOM link. The administrator can ping from VDOM A to an interface in VDOM B, but traffic from VDOM B to VDOM A times out. 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
✓
The route back to the source subnet is missing in VDOM A
The correct answer is B because inter-VDOM routing requires a route in both directions. Since the administrator can ping from VDOM A to VDOM B, the forward path works, but the return traffic from VDOM B to VDOM A fails due to a missing route back to the source subnet in VDOM A. This is a classic asymmetric routing issue where the destination VDOM (A) does not know how to reach the source subnet of VDOM B.
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.
✗
VDOM B has no traffic VDOM capability
Why it's wrong here
Both VDOMs must be traffic VDOMs to route traffic; if B were administrative only, the VDOM link wouldn't work.
✓
The route back to the source subnet is missing in VDOM A
Why this is correct
For traffic from B to A to succeed, VDOM A must have a route back to the source subnet. Without it, return traffic is dropped.
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 firewall policy in VDOM B is blocking traffic
Why it's wrong here
The ping from A to B works, indicating policies in B allow ICMP. The issue is in the return path.
✗
The VDOM link's MTU is set too high
Why it's wrong here
MTU mismatch would affect both directions equally, not just one.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a successful ping in one direction implies full bidirectional connectivity, overlooking that each VDOM maintains an independent routing table and the return path must be explicitly configured.
Detailed technical explanation
How to think about this question
Inter-VDOM routing via a VDOM link creates a logical point-to-point link between VDOMs, each with its own routing table. When VDOM A sends a ping to VDOM B, VDOM B receives it and must send a reply; if VDOM B's routing table does not have a route back to the source subnet (e.g., via the VDOM link or a static route), the reply is dropped. This is analogous to a missing return route in a hub-and-spoke VPN scenario, and can be verified with 'get router info routing-table' on each VDOM.
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: The route back to the source subnet is missing in VDOM A — The correct answer is B because inter-VDOM routing requires a route in both directions. Since the administrator can ping from VDOM A to VDOM B, the forward path works, but the return traffic from VDOM B to VDOM A fails due to a missing route back to the source subnet in VDOM A. This is a classic asymmetric routing issue where the destination VDOM (A) does not know how to reach the source subnet of VDOM B.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.