NSE4 High Availability and Diagnostics Practice Question
What is the function of Zero Trust Network Access (ZTNA) on a FortiGate?
⚠ Common exam trap
NSE4 often tests the misconception that ZTNA is a replacement for VPNs or firewalls, when it is actually a complementary access control mechanism that requires identity and posture checks.
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
✓
It allows users to securely access internal applications without a VPN, based on identity and device posture
ZTNA on FortiGate provides secure, identity-based access to internal applications without requiring a traditional VPN tunnel. It evaluates user identity and device posture before granting access, ensuring that only authorized users and compliant devices can reach specific applications. This aligns with the Zero Trust principle of 'never trust, always verify' and is implemented via FortiGate's ZTNA features, often integrated with FortiClient and FortiAuthenticator.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It allows users to securely access internal applications without a VPN, based on identity and device posture
Why this is correct
ZTNA enables per-application, identity-based access control: the FortiGate acts as an access proxy, authenticating the user (via SAML, LDAP, or local login) and verifying device posture (using FortiClient or other telemetry) before allowing a short-lived, encrypted session to a specific internal application. This eliminates the need for a full VPN tunnel, enforcing least-privilege access while keeping the user unaware of the complete internal network.
- ✗
It replaces the firewall policy for all traffic
Why it's wrong here
ZTNA does not replace firewall policies; it operates alongside them. Firewall policies remain the foundation for network traffic control, segmentation, and security inspection. Even with ZTNA, firewall rules still govern the flow of traffic between zones, enable intrusion prevention, and control east-west movement. ZTNA adds an application-level layer of access control, but it is evaluated in addition to, not instead of, the existing firewall policy set.
- ✗
It encrypts all traffic between the FortiGate and the internet
Why it's wrong here
ZTNA is fundamentally an access-control mechanism, not a blanket encryption solution. While the FortiGate establishes TLS-encrypted proxy sessions between the user and the application, ZTNA does not encrypt all internet-bound traffic. IPsec VPN, SSL VPN, or explicit HTTPS inspection handles bulk traffic encryption and visibility. ZTNA's encryption is limited to the specific application session and is a means to secure the access path, not a general-purpose encryption feature.
- ✗
It is a cloud-based subscription for antivirus updates
Why it's wrong here
Antivirus signatures and threat intelligence updates are delivered through FortiGuard subscriptions, which are separate licensing services that update FortiGate or FortiClient with the latest malware definitions and URL categorization. ZTNA is not a subscription service for antivirus; it is a licensed security feature that provides identity- and posture-based access control to applications. Confusing the two conflates threat intelligence delivery with access management—two distinct pillars of Fortinet's security architecture.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Fortinet exam blueprint
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.