NSE7 Advanced VPN and Zero Trust Practice Question
A FortiGate administrator configures a hub-and-spoke ADVPN with OSPF over the VPN overlay. Spoke routers receive the OSPF default route from the hub, but cannot reach subnets behind other spokes. What configuration is missing?
⚠ Common exam trap
It's easy for candidates to assume OSPF automatically advertises all connected interfaces, but in an overlay VPN, the spoke’s LAN interfaces are not part of the OSPF process unless explicitly redistributed.
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
✓
OSPF is not configured to redistribute connected or static routes on the spokes
In a hub-and-spoke ADVPN with OSPF, spoke routers receive the default route from the hub but cannot reach subnets behind other spokes because OSPF does not automatically advertise the spoke’s local networks into the VPN overlay. The missing configuration is redistribution of connected or static routes into OSPF on the spokes, which is required for the hub to learn those subnets and propagate them to other spokes via the OSPF database.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IKEv2 is configured instead of IKEv1
Why it's wrong here
Both IKEv1 and IKEv2 support OSPF over VPN; the version is not the cause.
- ✗
The spokes have 'set auto-discovery-receiver enable' configured
Why it's wrong here
This is necessary for shortcut tunnels but not for basic OSPF route exchange; if OSPF is working, routes from other spokes would be learned but may be suboptimal.
- ✓
OSPF is not configured to redistribute connected or static routes on the spokes
Why this is correct
Each spoke must redistribute its local subnets into OSPF so the hub and other spokes learn them. Without redistribution, the hub only knows its own directly connected networks.
- ✗
The hub has 'set auto-discovery-sender enable' configured
Why it's wrong here
This enables the hub to send shortcut route advertisements, but the immediate issue is that spokes are not learning other spoke subnets; this is likely an OSPF issue.
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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.