- A
Assign a public IP address to the SSL VPN interface
Why wrong: The SSL VPN interface typically uses a private IP; public IP is on the WAN.
- B
Configure a firewall policy allowing the SSL VPN interface to the internet interface with NAT enabled
This allows internet-bound traffic from VPN clients to exit directly.
- C
Create a routing policy on the SSL VPN settings to define which subnets are tunneled
The routing policy tells the client which destinations go through the tunnel; others go direct.
- D
Configure a static route on the FortiGate to send all traffic through the SSL VPN tunnel
Why wrong: That would force all traffic into the tunnel, opposite of split tunneling.
- E
Set the SSL VPN tunnel mode client configuration to enable split tunneling
Without enabling split tunneling in the client config, all traffic goes through the tunnel.
Quick Answer
The answer is that three configurations are required on the FortiGate: enabling split tunneling in the SSL VPN tunnel mode client configuration, creating a routing policy to push specific internal routes to the remote client, and configuring a firewall policy that permits traffic from the SSL VPN interface to the internet, typically with NAT enabled. This works because split tunneling allows the client to send only corporate-bound traffic through the encrypted tunnel while directing all other internet traffic locally, reducing bandwidth load on the FortiGate. On the Fortinet NSE 4 Network Security Professional exam, this question tests your understanding of how SSL VPN split tunneling configuration integrates routing and firewall policies—a common trap is forgetting the routing policy, which is essential for pushing the correct destination networks to the client. A useful memory tip is “Tunnel, Route, Permit”: first enable split tunneling in the client config, then define the routes to push, and finally permit the internet-bound traffic with a firewall policy.
NSE4 Authentication and VPN Practice Question
This NSE4 practice question tests your understanding of authentication and vpn. 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 company wants to implement SSL VPN split tunneling to allow remote users to access both internal resources and the internet directly. Which three configurations are required on the FortiGate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure a firewall policy allowing the SSL VPN interface to the internet interface with NAT enabled
Split tunneling requires a routing policy to push specific routes to the client, a firewall policy that permits traffic from the SSL VPN interface to the internet (with appropriate NAT if needed), and the tunnel mode client configuration must have split tunneling enabled.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Assign a public IP address to the SSL VPN interface
- ✓
Configure a firewall policy allowing the SSL VPN interface to the internet interface with NAT enabled
- ✓
Create a routing policy on the SSL VPN settings to define which subnets are tunneled
Why this is correct
The routing policy tells the client which destinations go through the tunnel; others go direct.
Related concept
CIDR notation defines the prefix length.
- ✗
Configure a static route on the FortiGate to send all traffic through the SSL VPN tunnel
Why it's wrong here
That would force all traffic into the tunnel, opposite of split tunneling.
- ✓
Set the SSL VPN tunnel mode client configuration to enable split tunneling
Why this is correct
Without enabling split tunneling in the client config, all traffic goes through the tunnel.
Related concept
CIDR notation defines the prefix length.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related NSE4 subnetting questions on CIDR, address ranges, and subnet selection.
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Authentication and VPN — study guide chapter
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Authentication and VPN practice questions
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FAQ
Questions learners often ask
What does this NSE4 question test?
Authentication and VPN — This question tests Authentication and VPN — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Configure a firewall policy allowing the SSL VPN interface to the internet interface with NAT enabled — Split tunneling requires a routing policy to push specific routes to the client, a firewall policy that permits traffic from the SSL VPN interface to the internet (with appropriate NAT if needed), and the tunnel mode client configuration must have split tunneling enabled.
What should I do if I get this NSE4 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related NSE4 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jun 21, 2026
This NSE4 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 NSE4 exam.
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