NSE7 Advanced VPN and Zero Trust Practice Question
A FortiGate admin is configuring a multi-peer IPsec VPN where the remote site has two ISPs for redundancy. The admin wants to ensure that if the primary ISP fails, the VPN automatically fails over to the secondary ISP without manual intervention. Which feature should be enabled?
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
✓
Dead Peer Detection (DPD) with retry and failover
DPD (Dead Peer Detection) with auto-negotiation allows the FortiGate to detect peer unreachability and automatically re-establish the tunnel using an alternate path if configured.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IPsec interface mode with DHCP
Why it's wrong here
DHCP is for obtaining IP addresses, not for failover.
- ✗
IKEv2 with mobility extension
Why it's wrong here
Mobility extension is for mobile IP changes, not for multi-ISP failover.
- ✗
Auto-negotiate phase 1 settings
Why it's wrong here
Auto-negotiation is for proposal matching, not failover.
- ✓
Dead Peer Detection (DPD) with retry and failover
Why this is correct
DPD detects when the peer is unreachable and can trigger failover to a secondary path or peer.
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.
Go deeper
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JA
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.