NSE7 Advanced VPN and Zero Trust Practice Question
An administrator configures OSPF over an IPsec VPN tunnel between two FortiGates. The OSPF adjacency does not form. The tunnel is up and ping works between the loopback interfaces used for OSPF. What is the MOST likely issue?
Answer choices
Why each option matters
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Correct answer & explanation
✓
The firewall policy allowing OSPF traffic (protocol 89) over the tunnel is missing.
Even if the tunnel is up, OSPF packets (protocol 89) must be explicitly permitted by a firewall policy on the tunnel. Without that policy, OSPF Hellos are dropped and adjacency fails. Network type mismatch can also cause issues, but the most common is missing policy.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 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 NSE7 exam.