The answer is missing firewall policies to permit traffic through the VPN tunnel. When the IPsec VPN tunnel is up but no traffic passes, the IKE gateway status shows "up" and the phase2 tunnel is established, yet both inbound and outbound byte counters remain at zero—this points directly to a policy or routing issue rather than an encryption or authentication failure. On the Fortinet NSE 7 Advanced Security NSE7 exam, this scenario tests your understanding that a tunnel being "up" only confirms the control plane is working; the data plane requires explicit firewall policies to allow traffic between the tunnel interface and the destination zone. A common trap is assuming the tunnel is fully functional because the IKE and IPsec phases completed, but without a policy permitting traffic, the FortiGate will silently drop packets. Remember the mnemonic: "Tunnel up, bytes zero? Check the policy, not the hero."
NSE7 Advanced VPN and Zero Trust Practice Question
This NSE7 practice question tests your understanding of advanced vpn and zero trust. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 administrator observes the following CLI output from 'diagnose vpn ike gateway list':
vd: root/0
name: VPN_TO_HUB
version: IKEv2
status: up
mode: main
DPD: on
...
Number of IPsec tunnels: 1
name: phase2_tunnel
status: up
inbound: 0 bytes
outbound: 0 bytes
The tunnel shows up but no traffic is passing. 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 not configured to permit traffic through the VPN tunnel
The output shows the IKE gateway is up but the IPsec tunnel has zero traffic. This often indicates a policy or routing misconfiguration. The most common cause is missing firewall policies to allow traffic through the tunnel.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Firewall policies are not configured to permit traffic through the VPN tunnel
Why this is correct
Without policies, traffic is dropped, resulting in zero bytes.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Dead Peer Detection is disabled
Why it's wrong here
DPD being off would not stop traffic; it would just not detect dead peers.
✗
The phase1 proposal is mismatched
Why it's wrong here
A mismatched proposal would prevent the gateway from coming up.
✗
The tunnel is in 'down' status
Why it's wrong here
The output shows 'status: up'.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
The output shows 'status: up'.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related NSE7 ACL questions on filtering logic and placement.
Advanced VPN and Zero Trust — This question tests Advanced VPN and Zero Trust — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Firewall policies are not configured to permit traffic through the VPN tunnel — The output shows the IKE gateway is up but the IPsec tunnel has zero traffic. This often indicates a policy or routing misconfiguration. The most common cause is missing firewall policies to allow traffic through the tunnel.
What should I do if I get this NSE7 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related NSE7 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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.