Into which two types of areas would an area border router (ABR) inject a default route?
(Choose two.)
A.
stub
B.
the autonomous system of an exterior gateway protocol (EGP)
C.
NSSA
D.
totally stubby
E.
the autonomous system of a different interior gateway protocol (IGP)
F.
area 0
Explanation:
Both stub area & totally stubby area allow an ABR to inject a default route. The main difference
between these 2 types of areas is:
+ Stub area replaces LSA Type 5 (External LSA – created by an ASBR to advertise network from
another autonomous system) with a default route + Totally stubby area replaces both LSA Type 5
and LSA Type 3 (Summary LSA – created by an ABR to advertise network from other areas, but
still within the AS, sometimes called interarea routes) with a default route.
Below summarizes the LSA Types allowed and not allowed in area types:
