H12-821_V1.0 · Question #910
When Filter-Policy is deployed in OSPF, Filter-Policy will modify the LSDB of OSPF.
The correct answer is B. FALSE. B is correct because Filter-Policy in OSPF operates on the routing table, not the Link State Database (LSDB). It filters which routes from the LSDB are installed into the local routing table (RIB), leaving the LSDB itself completely intact and unchanged. Why A is wrong: The…
Question
Options
- ATRUE
- BFALSE
- C
- D
How the community answered
(38 responses)- A8% (3)
- B74% (28)
- C3% (1)
- D16% (6)
Explanation
B is correct because Filter-Policy in OSPF operates on the routing table, not the Link State Database (LSDB). It filters which routes from the LSDB are installed into the local routing table (RIB), leaving the LSDB itself completely intact and unchanged.
Why A is wrong: The LSDB in OSPF must remain consistent across all routers within an area - this is a core OSPF requirement for loop-free convergence. Any mechanism that modified the LSDB would break that synchronization and violate the OSPF protocol's fundamental design.
Memory tip: Think of the LSDB as a read-only map of the entire network that every router shares identically. Filter-Policy acts like a highlighter on your copy of the directions - it affects which routes you actually follow (routing table), but never erases or rewrites the underlying map (LSDB).
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