H12-821_V1.0 · Question #804
The interface using Silent-Interface will not receive and send OSPF messages, but directly connected routes can be advertised to OSPF.
The correct answer is A. TRUE. Option A is correct because the Silent-Interface feature (called passive-interface on many vendors) suppresses OSPF Hello packet transmission and reception on that interface, preventing neighbor adjacency formation. However, the subnet directly connected to that interface is…
Question
Options
- ATRUE
- BFALSE
How the community answered
(48 responses)- A75% (36)
- B25% (12)
Explanation
Option A is correct because the Silent-Interface feature (called passive-interface on many vendors) suppresses OSPF Hello packet transmission and reception on that interface, preventing neighbor adjacency formation. However, the subnet directly connected to that interface is still injected into the OSPF routing domain as a Type-1 Router LSA, so other routers learn the route. This is the key distinction: participation in OSPF messaging (neighbor discovery, adjacency) is blocked, but route advertisement is not.
Option B is wrong because it incorrectly assumes that blocking OSPF messages also blocks route advertisement - these are two separate functions in OSPF.
Memory tip: Think of Silent-Interface as "listen to no one, but still show up on the map." The router stays quiet on that link, yet the connected network still appears in the OSPF topology.
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