FORTINET-NSE56 Nse6 Security Fabric Specialist Topics Practice Question
When using FortiAuthenticator to provide RADIUS authentication for a third-party VPN gateway, which setting must match between the two devices?
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
✓
The Shared Secret
The Shared Secret is the mandatory security parameter for RADIUS communication between a client and a server.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The Shared Secret
Why this is correct
The shared secret is the cryptographic key used to secure RADIUS packets.
- ✗
The RADIUS accounting port
Why it's wrong here
Accounting is optional and separate from authentication.
- ✗
The NAS-IP-Address
Why it's wrong here
This is useful but not mandatory for basic auth functionality.
- ✗
The VSA Vendor ID
Why it's wrong here
This is only needed if advanced attribute mapping is required.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Fortinet exam blueprint
This FORTINET-NSE56 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 FORTINET-NSE56 exam.