NSE7 Advanced VPN and Zero Trust Practice Question
An administrator is troubleshooting an IPsec VPN tunnel that connects a branch office to the main office. The tunnel is down. The administrator runs 'diagnose vpn ike gateway list' and sees the following output: IKE gateway: branch state: down DPD: enabled DPD retrycount: 3 DPD retryinterval: 10 What does the DPD configuration indicate?
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 tunnel will be brought down after 3 unanswered DPD probes, each 10 seconds apart
DPD (Dead Peer Detection) is configured with a retry count of 3 and a retry interval of 10 seconds. This means the FortiGate will send DPD probes every 10 seconds and after 3 consecutive failures (30 seconds total without response), it will consider the peer dead. The tunnel is currently down, likely because DPD detected the peer as unreachable.
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 tunnel will be brought down immediately after the first DPD timeout
Why it's wrong here
It requires 3 consecutive failures.
- ✗
The tunnel will stay up indefinitely because DPD is disabled
Why it's wrong here
DPD is enabled as shown.
- ✓
The tunnel will be brought down after 3 unanswered DPD probes, each 10 seconds apart
Why this is correct
This is the correct interpretation of the DPD retrycount and retryinterval.
- ✗
DPD will send probes every 30 seconds
Why it's wrong here
The retryinterval is 10 seconds, not 30.
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.