NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate is configured with BGP and OSPF. The administrator wants to ensure that routes learned via BGP are redistributed into OSPF, but only specific prefixes. Which three components are needed? (Select THREE.)
⚠ Common exam trap
Candidates often confuse distribute lists (which filter OSPF routes received from neighbors) with route maps used for redistribution filtering, leading them to select option E instead of understanding that redistribution filtering requires a route map referencing a prefix list.
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
✓
A route map that references the prefix list and sets OSPF parameters
A route map is required to match the specific prefixes (via the prefix list) and to set OSPF metric or metric-type parameters when redistributing BGP routes into OSPF. Without the route map, redistribution would apply to all BGP routes or use default OSPF parameters, which does not meet the requirement of controlling which prefixes are redistributed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A route map that references the prefix list and sets OSPF parameters
Why this is correct
Route map ties together match (prefix list) and set actions (metric, tag).
- ✓
Redistribution of BGP into OSPF under router ospf with the route map applied
Why this is correct
The redistribute command under OSPF with the route map enables selective redistribution.
- ✗
A VRF to separate the routing tables
Why it's wrong here
VRFs are not necessary for redistribution between protocols in the same VDOM.
- ✓
A prefix list to match the desired BGP routes
Why this is correct
Prefix list matches specific prefixes for redistribution.
- ✗
A distribute list in OSPF to filter incoming routes
Why it's wrong here
Distribute list filters routes on the receiving side, not for redistribution out.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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