Quick Answer
The answer is ZTNA, or Zero Trust Network Access, which is the correct FortiGate feature for enabling agentless access to internal applications without requiring a VPN client. This works because ZTNA verifies user identity and device context at the application layer before granting access, rather than relying on a traditional network-level tunnel. On the Fortinet NSE 4 Network Security Professional exam, this concept tests your understanding of how ZTNA replaces legacy VPNs by using FortiGate’s identity-based policies and the FortiClient telemetry—or even agentless browser-based access—to enforce least-privilege access. A common trap is confusing ZTNA with IPsec or SSL VPN; remember that ZTNA does not require a full client installation, making it ideal for remote users needing quick, context-aware access to internal apps. Memory tip: think “Zero Tunnel, No Agent”—ZTNA cuts the VPN client and checks identity instead.
This NSE4 practice question tests your understanding of high availability and diagnostics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which FortiGate feature allows users to access internal applications without a VPN client?
IPsec VPN
Why wrong: IPsec VPN requires a client.
SSL VPN
Why wrong: SSL VPN typically requires a client or web portal, but not agentless like ZTNA.
ZTNA
ZTNA provides agentless access to applications using identity-based policies.
FortiGuard
Why wrong: FortiGuard is a subscription service for security updates.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ZTNA
ZTNA (Zero Trust Network Access) enables agentless access to applications based on identity and context.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
IPsec VPN
SSL VPN
ZTNA
Why this is correct
ZTNA provides agentless access to applications using identity-based policies.
Related concept
Read the scenario before looking for a memorised answer.
FortiGuard
Why it's wrong here
FortiGuard is a subscription service for security updates.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the NSE4 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
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
High Availability and Diagnostics — This question tests High Availability and Diagnostics — Read the scenario before looking for a memorised answer..
The correct answer is: ZTNA — ZTNA (Zero Trust Network Access) enables agentless access to applications based on identity and context.
Identify which NSE4 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. What is the function of Zero Trust Network Access (ZTNA) on a FortiGate?
easyWhy A: ZTNA provides secure access to applications based on identity and device posture, without requiring a VPN.
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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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