NSE7 Advanced Networking and SD-WAN Practice Question
This NSE7 practice question tests your understanding of advanced networking and sd-wan. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is running OSPF with multiple areas. The administrator notices that routes from area 1 are not being redistributed into area 0. The ABR has the following configuration: 'config router ospf
config area
edit 0.0.0.0
set type nssa
end
config area
edit 0.0.0.1
set type standard
end
end'. What is the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Area 0 is configured as NSSA, which does not accept type 3 LSAs from other areas.
In OSPF, area 0 must be a standard area (or at least not NSSA) for inter-area routes to be advertised. NSSA areas block type 3 LSAs by default.
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 ABR must have 'set type standard' for area 0.
Why it's wrong here
While changing area 0 to standard would fix it, the current configuration has area 0 as NSSA, which is the root cause.
✓
Area 0 is configured as NSSA, which does not accept type 3 LSAs from other areas.
Why this is correct
NSSA areas do not allow type 3 summary LSAs. Routes from other areas are not injected into an NSSA area unless special options are used.
The ABR is missing a 'redistribute connected' command.
Why it's wrong here
The issue is inter-area route propagation, not redistribution of connected routes.
✗
Area 1 is not configured as NSSA, so routes cannot be redistributed.
Why it's wrong here
Area 1 is standard, which can send type 3 LSAs to the backbone; the problem is the backbone area type.
Common exam traps
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 Networking and SD-WAN — This question tests Advanced Networking and SD-WAN — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Area 0 is configured as NSSA, which does not accept type 3 LSAs from other areas. — In OSPF, area 0 must be a standard area (or at least not NSSA) for inter-area routes to be advertised. NSSA areas block type 3 LSAs by default.
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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