NSE7 Advanced Networking and SD-WAN Practice Question
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?
⚠ Common exam trap
Test-takers frequently assume area 0 must always be a standard area, but FortiGate allows area 0 to be NSSA, and the real issue is the NSSA's default behavior of blocking Type 3 LSAs from other areas.
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
✓
Area 0 is configured as NSSA, which does not accept type 3 LSAs from other areas.
Area 0 is configured as an NSSA (Not-So-Stubby Area), which by default does not accept Type 3 summary LSAs from other areas. Since routes from area 1 (a standard area) are injected into the ABR as Type 3 LSAs, they are blocked by the NSSA area 0 boundary. This prevents inter-area route redistribution into area 0.
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.
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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.