NSE7 Advanced VPN and Zero Trust Practice Question
A FortiGate administrator configures a multi-peer IPsec VPN with two remote gateways for redundancy. The phase 1 configuration has 'set proposal aes256-sha256' and 'set dpd on-idle'. The tunnel is established but traffic fails over to the backup peer only after a long delay. What change would improve failover time?
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
✓
Change DPD mode to 'on-demand' and reduce retry count
DPD on-idle sends probes only when there is no traffic. With DPD on-idle, failure detection can be slow. Changing to DPD on-demand (active probing) or reducing retry intervals speeds up failure detection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the phase 2 lifetime
Why it's wrong here
Lifetime does not affect failure detection.
- ✗
Enable NAT traversal
Why it's wrong here
NAT traversal is for NAT issues, not failover speed.
- ✗
Use IKEv1 instead of IKEv2
Why it's wrong here
IKE version does not directly affect failover speed.
- ✓
Change DPD mode to 'on-demand' and reduce retry count
Why this is correct
On-demand sends DPD probes regularly regardless of traffic, enabling faster detection.
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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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.