The answer is that the OSPF network type on the tunnel interfaces must be set to point-to-point. This is necessary because ADVPN creates dynamic spoke-to-spoke tunnels that behave like point-to-point links, and OSPF’s default broadcast network type would trigger a Designated Router election, which cannot function reliably over IPsec VPNs with dynamic IPs. On the Fortinet NSE 7 Advanced Security NSE7 exam, this condition tests your understanding of how OSPF interacts with overlay routing in hub-and-spoke topologies; a common trap is leaving the network type as broadcast, which causes neighbor flapping and incomplete LSDBs. To remember, think “P2P for VPN” — point-to-point avoids DR/BDR complexity and ensures stable adjacency over ADVPN shortcuts.
NSE7 Advanced VPN and Zero Trust Practice Question
This NSE7 practice question tests your understanding of advanced vpn and zero trust. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A FortiGate administrator is configuring OSPF over an IPsec VPN overlay in a hub-and-spoke topology. The spokes have dynamic IPs and use ADVPN. Which THREE conditions are necessary for OSPF to work correctly over the VPN tunnels?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The OSPF router ID must be unique across all spokes
OSPF requires stable network types and correct interface configuration. For ADVPN, OSPF should use point-to-point network type to avoid DR elections and ensure proper neighbor relationships.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 OSPF router ID must be unique across all spokes
Why this is correct
OSPF router IDs must be unique to prevent routing issues.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related NSE7 OSPF questions on adjacency and route selection.
Advanced VPN and Zero Trust — This question tests Advanced VPN and Zero Trust — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The OSPF router ID must be unique across all spokes — OSPF requires stable network types and correct interface configuration. For ADVPN, OSPF should use point-to-point network type to avoid DR elections and ensure proper neighbor relationships.
What should I do if I get this NSE7 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related NSE7 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Question Discussion
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