- A
Set the SSL VPN portal's 'tunnel mode' to 'web-only'
Why wrong: 'web-only' is not a valid tunnel mode; web mode is separate from tunnel mode.
- B
Configure the SSL VPN portal to push routes for 192.168.1.0/24 to the client
Pushing routes ensures the client knows to send traffic for the corporate subnet through the VPN tunnel.
- C
In the SSL VPN settings, enable 'split tunneling' and configure the destination routes to include only 192.168.1.0/24
Split tunneling allows the client to access the internet directly; the destination routes control which traffic goes through the tunnel.
- D
Disable 'tunnel mode' and use 'web mode' instead
Why wrong: Web mode does not support split tunneling in the same way; tunnel mode is required.
- E
Create a firewall policy on the FortiGate allowing traffic from the SSL VPN interface to the corporate network
Why wrong: This is a general requirement for any VPN but not specific to split tunneling; it's always needed.
Quick Answer
The answer is to enable split tunneling and configure the destination routes to include only the 192.168.1.0/24 subnet. This is correct because split tunneling allows the remote user’s device to send internet-bound traffic directly to the web without passing through the VPN, while the destination routes explicitly tell the FortiGate which corporate subnet should be encrypted and tunneled. On the Fortinet NSE 4 Network Security Professional NSE4 exam, this scenario tests your understanding of SSL VPN tunnel mode routing logic—a common trap is assuming that enabling split tunneling alone is sufficient, but you must also define the specific corporate subnet in the routing rules to avoid routing all traffic through the VPN. A helpful memory tip is “split the traffic, route the subnet”—remember that split tunneling controls the permission, and destination routes control the path.
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 FortiGate administrator is configuring an SSL VPN tunnel mode for remote users. The administrator wants to ensure that only traffic destined for the corporate network (192.168.1.0/24) goes through the VPN, and all other traffic (e.g., internet) goes directly from the user's device. Which TWO configuration steps are required?
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 the SSL VPN portal to push routes for 192.168.1.0/24 to the client
Options B and C are correct. Split tunneling must be enabled to allow direct internet access. Additionally, the routing rules (or destination routes) must specify that only the corporate subnet is routed through the VPN tunnel.
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.
- ✗
Set the SSL VPN portal's 'tunnel mode' to 'web-only'
Why it's wrong here
'web-only' is not a valid tunnel mode; web mode is separate from tunnel mode.
- ✓
Configure the SSL VPN portal to push routes for 192.168.1.0/24 to the client
- ✓
In the SSL VPN settings, enable 'split tunneling' and configure the destination routes to include only 192.168.1.0/24
Why this is correct
Split tunneling allows the client to access the internet directly; the destination routes control which traffic goes through the tunnel.
Related concept
CIDR notation defines the prefix length.
- ✗
Disable 'tunnel mode' and use 'web mode' instead
Why it's wrong here
Web mode does not support split tunneling in the same way; tunnel mode is required.
- ✗
Create a firewall policy on the FortiGate allowing traffic from the SSL VPN interface to the corporate network
Why it's wrong here
This is a general requirement for any VPN but not specific to split tunneling; it's always needed.
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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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 the SSL VPN portal to push routes for 192.168.1.0/24 to the client — Options B and C are correct. Split tunneling must be enabled to allow direct internet access. Additionally, the routing rules (or destination routes) must specify that only the corporate subnet is routed through the VPN tunnel.
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.
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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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