单项选择题
Which OSPF router type summarizes network advertisements from one OSPF area into another?（）
A.A B.B C.C D.D
Which type of router cannot exist within a stub area?（）...
Which type of router cannot exist within a stub area?（）
Which OSPF area type allows for the flooding of a Type ...
单项选择题Which OSPF area type allows for the flooding of a Type 7 LSA?（）
A.stub B.transit C.border D.not-so-stubby
An OSPF non-backbone area allows external routes to be ...
An OSPF non-backbone area allows external routes to be flooded within the area. These external routes are propagated into the backbone. However, external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe?（）
