NSE7 Advanced VPN and Zero Trust Practice Question
An administrator notices that after upgrading FortiOS, the ADVPN shortcut tunnels are no longer being established. The hub and spokes have the same ADVPN configuration as before. What is the most likely cause?
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 spokes do not have routes to each other's networks via the hub
ADVPN shortcut tunnel initiation may require proper routing. If dynamic routing (e.g., BGP or OSPF) is not advertising the spoke networks to each other, spokes won't have routes to trigger shortcuts.
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 spokes do not have routes to each other's networks via the hub
Why this is correct
Shortcut tunnels are triggered when a spoke has traffic to another spoke's network but no direct route; if routing is not working (e.g., BGP not advertising), shortcuts won't be negotiated.
- ✗
The IKE version changed to IKEv1
Why it's wrong here
ADVPN works with both IKEv1 and IKEv2; version change wouldn't break shortcuts.
- ✗
Dead Peer Detection (DPD) is disabled on the tunnel
Why it's wrong here
DPD is used for liveness detection, not shortcut establishment.
- ✗
The hub's ADVPN configuration was reset during upgrade
Why it's wrong here
Configurations are preserved across upgrades unless a reset occurs, which is unlikely.
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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.