A transit authority needs to inject a local LTE backup prefix into OSPF inside a stub-like area without opening that area to every external LSA from the backbone. Which area type fits?
Select an answer to reveal the explanation.
Short Explanation
NSSA is the special side door on a stub neighborhood. You can roll one local LTE route in through that door (Type-7), but you don’t have to open the street to every external from the rest of the city. Stub-like peace plus one controlled injection.
Full Explanation
Not-so-stubby areas (NSSA) block regular Type-5 external LSAs from entering the area while still allowing a local ASBR to originate Type-7 externals that ABRs can translate. That matches injecting a site-specific LTE route without accepting the full external set. Totally stubby areas do not provide that local external injection model. Area 0 exclusivity and opaque-LSA myths misstate OSPF area capabilities.