NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate is running OSPF in a multi-area topology. The administrator needs to redistribute connected routes from area 0 into area 1 but does not want to leak any other routes. Which configuration is correct?
⚠ Common exam trap
Many candidates confuse OSPF network statements (which enable OSPF on interfaces and advertise directly connected networks) with route redistribution, mistakenly thinking that adding a network statement in area 1 will selectively leak routes from area 0, when in fact network statements only advertise the interface's own subnet and cannot import routes from another area.
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
✓
Configure route redistribution under OSPF with 'redistribute connected' and apply a route map that permits only the desired connected networks.
OSPF does not automatically redistribute connected routes between areas; it only advertises routes learned via OSPF. To inject connected routes from area 0 into area 1 without leaking other routes, you must use 'redistribute connected' under OSPF and apply a route map that explicitly permits only the desired connected networks. This ensures that only those specific prefixes are advertised as Type 5 or Type 7 LSAs into area 1, while all other routes remain unaffected.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use policy-based routing to forward traffic to the connected networks.
Why it's wrong here
PBR does not affect OSPF route advertisement.
- ✗
Add the connected networks as networks in area 1 using 'network x.x.x.x 255.255.255.0 area 1'.
Why it's wrong here
This would include the interface in OSPF, but it would advertise the route as an OSPF internal route, not redistributed. Also, it might require the interface to be in that area.
- ✓
Configure route redistribution under OSPF with 'redistribute connected' and apply a route map that permits only the desired connected networks.
Why this is correct
Using redistribution with a route map allows selective advertisement of only the specified connected routes.
- ✗
Use 'set redistribute connected' under the OSPF interface configuration for the connected interface in area 0.
Why it's wrong here
The redistribute command is global under OSPF, not per-interface.
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Written by Johnson Ajibi, MSc IT Security
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